Browse Definitions by Alphabet

H.2 - HEX

H.245 - H.245 is a protocol for the transmission of call management and control signals in packet-based networks using H.
H.264 (MPEG-4 AVC) - H.264, also known as MPEG-4 AVC (Advanced Video Coding), is a video compression standard that offers significantly greater compression than its predecessors.
HA storage (high-availability storage) - High-availability storage (HA storage) is a storage system that is continuously operational or provides at least 99% uptime.
hackathon - A hackathon, also known as a codefest, is a social coding event that brings computer programmers and other interested people together to improve upon or build a new software program.
hacker - A hacker is an individual who uses computer, networking or other skills to overcome a technical problem.
hacking as a service (HaaS) - Hacking as a service (HaaS) is the commercialization of hacking skills, in which the hacker serves as a contractor.
hacktivism - Hacktivism is the act of misusing a computer system or network for a socially or politically motivated reason.
Hadoop - Hadoop is an open source distributed processing framework that manages data processing and storage for big data applications running in clustered systems.
Hadoop 2 - Apache Hadoop 2 is the second iteration of the Hadoop framework for distributed data processing.
Hadoop as a service (HaaS) - Hadoop as a service (HaaS), also known as Hadoop in the cloud, is a big data analytics framework that stores and analyzes data in the cloud using Hadoop.
Hadoop cluster - A Hadoop cluster is a special type of computational cluster designed specifically for storing and analyzing huge amounts of unstructured data in a distributed computing environment.
Hadoop data lake - A Hadoop data lake is a data management platform comprising one or more Hadoop clusters.
Hadoop Distributed File System (HDFS) - The Hadoop Distributed File System (HDFS) is the primary data storage system used by Hadoop applications.
hairpinning - In general telecommunication, hairpinning is returning a message from an origin endpoint back in the direction it came from as a way to get it to its destination endpoint.
half-duplex - Half-duplex data transmission means that data can be transmitted in both directions on a signal carrier, but not at the same time.
half-life - In science, a half-life (also, as a noun, spelled half life) is the amount of time it takes for half of a substance or entity to undergo some specified process.
Hall effect - The Hall effect is the movement of charge carriers through a conductor towards a magnetic attraction.
Halloween II: Do you speak -- eek! -- Geek? - A WhatIs.com tech quiz with a Halloween theme: Does Nightmare Freddie of Elm Street fame use one of these for manicures? It's a type of space-saving server for a single, dedicated application.
halo effect - The halo effect is a form of cognitive bias which causes one part to make the whole seem more attractive or desirable.
Halogen Software Inc. - Halogen Software Inc.
hamburger icon (slide drawer navigation) - The hamburger icon got its name because it resembles a burger in a bun.
Hamming code - Hamming code is an error correction system that can detect and correct errors when data is stored or transmitted.
handheld - A handheld computer is a computer that can conveniently be stored in a pocket (of sufficient size) and used while you're holding it.
hands-off infrastructure management - Hands-off infrastructure management is the remote, automated administration of server, storage and network resources.
hangup (or hang) - A hangup, also called a hang, is a condition that sometimes occurs when computer programs conflict or do not run properly.
happy path testing - Happy-path testing is a type of software testing that uses known input and produces an expected output.
HAProxy - HAProxy (High Availability Proxy), developed by HAProxy Technologies LLC, is an open source load balancer proxy for TCP and HTTP applications.
haptics - Haptics (pronounced HAP-tiks) is the science of applying touch (tactile) sensation and control to interaction with computer applications.
hard bounce - A hard bounce is an e-mail message that has been returned to the sender because the recipient's address is invalid.
hard copy (printout) - A hard copy (or "hardcopy") is a printed copy of information from a computer.
hard disk drive (HDD) - A computer hard disk drive (HDD) is a non-volatile data storage device.
hard drive shredder - A hard drive shredder is a mechanical device that physically destroys old hard drives in such a way that the data they contain cannot be recovered.
hard error - A hard error is an issue in RAM that results from a permanent physical flaw in the module caused by a hardware failure or defect.
hard real-time system (immediate real-time system) - A hard real-time system (also known as an immediate real-time system) is hardware or software that must operate within the confines of a stringent deadline.
hard reset (factory reset; master reset) - A hard reset, also known as a factory reset or master reset, is the restoration of a device, such as a smartphone or tablet, to its state when it left the factory.
hard skills - Hard skills are specific abilities, or capabilities, that an individual can possess and demonstrate in a measured way.
hard zoning - Hard zoning is used to allocate resources and control access in a storage-area network (SAN).
hard-drive encryption - Hard-drive encryption is a technology that encrypts the data stored on a hard drive using sophisticated mathematical functions.
hardcode - In computer programming or text markup, to hardcode (less frequently, hard code) is to use an explicit rather than a symbolic name for something that is likely to change at a later time.
hardware abstraction layer (HAL) - In computers, a hardware abstraction layer (HAL) is a layer of programming that allows a computer operating system to interact with a hardware device at a general or abstract level rather than at a detailed hardware level.
hardware clustering - Hardware clustering is a hardware-based method of turning multiple servers into a cluster (a group of servers that acts like a single system).
hardware emulation - Hardware emulation is the use of one hardware device to mimic the function of another hardware device.
hardware RAID (hardware redundant array of independent disk) - Hardware RAID is a form of RAID where processing is done externally.
hardware security - Hardware security is vulnerability protection that comes in the form of a physical device rather than software that's installed on the hardware of a computer system.
hardware security module (HSM) - A hardware security module (HSM) is a physical device that provides extra security for sensitive data.
hardware virtualization - Hardware virtualization, which is also known as server virtualization or simply virtualization, is the abstraction of computing resources from the software that uses those resources.
hardware vulnerability - A hardware vulnerability is an exploitable weakness in a computer system that enables attack through remote or physical access to system hardware.
hardware-as-a-service (in managed services) - Hardware-as-a-service (HaaS) is a procurement model that is similar to leasing or licensing in which hardware that belongs to a managed service provider (MSP) is installed at a customer's site and a service level agreement (SLA) defines the responsibilities of both parties.
hardware-assisted virtualization - Hardware-assisted virtualization is the use of a computer's physical components to support the software that creates and manages virtual machines (VMs).
harmonic - A harmonic is a wave or signal whose frequency is an integral (whole number) multiple of the frequency of the same reference signal or wave.
Hartree energy - The Hartree energy is a physical constant equal to twice the binding energy of the electron in the ground state (the lowest-energy state) of the hydrogen atom.
Hash-based Message Authentication Code (HMAC) - Hash-based Message Authentication Code (HMAC) is a message authentication code that uses a cryptographic key in conjunction with a hash function.
HashiCorp - HashiCorp is a software company that provides a suite of modular DevOps infrastructure provisioning and management products.
hashing - Hashing is the process of transforming any given key or a string of characters into another value.
Haswell - Haswell is the code name for Intel's 4th generation Core i-based processors.
hate speech - Hate speech is a verbal or written communication expressing a generalized negative opinion about a particular demographic, sometimes attacking an individual as a member of that group.
Have I Been Pwned (HIBP) - Have I Been Pwned (HIBP) is a website that allows users to search and find out if an email address’s password has been compromised.
Hawthorne effect - The Hawthorne effect is the modification of behavior by study participants in response to their knowledge that they are being observed or singled out for special treatment.
HCI (human-computer interaction) - HCI (human-computer interaction) is the study of how people interact with computers and to what extent computers are or are not developed for successful interaction with human beings.
HD-DVD (high-definition DVD) - HD-DVD (high-definition DVD) is a defunct high-capacity optical storage medium that was once seen as the successor to the DVD.
HDD form factor (hard disk drive form factor) - HDD form factor is the size or geometry of a hard disk drive, determining the device’s compatibility with the drive bays in a storage array or enclosure, server, portable computer or other computing device.
HDLC (High-level Data Link Control) - HDLC (High-level Data Link Control) is a group of protocols or rules for transmitting data between network points (sometimes called nodes).
HDMI - HDMI (High Definition Multimedia Interface) is a specification that combines video and audio into a single digital interface for use with digital versatile disc (DVD) players, digital television (DTV) players, set-top boxes, and other audiovisual devices.
HDTV (high definition television) - HDTV (high definition television) is a television display technology that provides picture quality similar to 35 mm.
HDX - Citrix HDX technology is a set of capabilities that work together to deliver a high-definition user experience of virtual desktops and applications to any device over any network from the data center.
head tracking - Head tracking is a software application that monitors a user’s head position and orientation.
header - In information technology, a header is, in general, something that goes in front of something else and is usually repeated as a standard part of the units of something else.
headless Android - Headless Android is a version of the Android operating system designed for embedded devices that lack user interfaces.
headless CMS (headless content management system) - A headless content management system (CMS) delivers back-end capabilities for editing, organizing and storing all types of digital information, without regard to how that content is published, displayed or used.
headless commerce (headless e-commerce) - Headless commerce, also called headless e-commerce, is a platform architecture that decouples the front end of an e-commerce website with the back end.
headless server - A headless server is a computing device without a local interface that is dedicated to providing services to other computers and their users.
headless system - A headless system is a computer that operates without a monitor, graphical user interface (GUI) or the typical peripherals used to control it, such as a keyboard and mouse.
heads-up display (HUD) - A heads-up display (HUD) is a transparent or miniaturized display technology that does not require users to shift their gaze from where they are naturally looking.
health informatics - Health informatics is the practice of acquiring, studying and managing health data and applying medical concepts in conjunction with health information technology systems to help clinicians provide better healthcare.
Health Information Exchange (HIE) - Health information exchange (HIE) is the electronic transmission of healthcare-related data among medical facilities, health information organizations -- companies that oversee and govern the exchange of this data -- and government agencies according to national standards.
Health IT (health information technology) - Health IT (health information technology) is the area of IT involving the design, development, creation, use and maintenance of information systems for the healthcare industry.
Healthcare CIO (healthcare chief information officer) - A healthcare CIO is a healthcare executive with an influence over technology purchasing and other IT business decisions.
Heap - Heap is a user analytics tool which can be utilized to capture all web, mobile and cloud-based user interactions in an application.
heap - In certain programming languages including C and Pascal, a heap is an area of pre-reserved computer main storage (memory) that a program process can use to store data in some variable amount that won't be known until the program is running.
Heartbeat - Heartbeat is a program that runs specialized scripts automatically whenever a system is initialized or rebooted.
Heartbleed - Heartbleed is a vulnerability in some implementations of OpenSSL.
heat - Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.
heat bed - A heat bed is an additional module for a 3D printer that makes the cooling process of 3D printed materials more controlled, for better results.
heat map (heatmap) - A heat map is a two-dimensional representation of data in which values are represented by colors.
heat pump - A heat pump is a device that takes heat from one source and moves it to another location through electric or mechanical means.
helium hard drive - A helium drive is a hard disk that exploits the characteristic lightness of that gas to increase the medium’s potential speed and storage density.
HELLO packet - A HELLO packet is a special data packet (message) that is sent out periodically from a router to establish and confirm network adjacency relationships to other routers in the Open Shortest Path First (OSPF) communications protocol.
Hello World - Hello World is a simple program that, when run, displays the message: Hello World.
help desk - A help desk is the individual, group, organizational function or external service that an IT user calls to get help with a problem.
help system (help file) - A help system (sometimes called a help file) is a documentation component of a software program that explains the features of the program and helps the user understand its capabilities.
henry (H) - The henry (symbolized H) is the Standard International (SI) unit of inductance.
henry per meter (H/m) - The henry per meter (symbolized H/m) is the unit of magnetic permeability in the International System of Units (SI).
Herman Hollerith - Born in 1860 in Buffalo, NY, Herman Hollerith was the creator of the Hollerith Electric Tabulating System, the ancestor to computers as we know them today.
Heroku - Heroku is a cloud-based development platform as a service (PaaS) provider.
hertz - Hertz is a unit of frequency (of change in state or cycle in a sound wave, alternating current, or other cyclical waveform) of one cycle per second.
heterogeneous - Heterogeneous (pronounced HEH-tuh-roh-DJEEN-ee-uhs, from the Greek heteros or "other" and genos or "kind") is the characteristic of containing dissimilar constituents.
heuristic - As an adjective, heuristic (pronounced hyu-RIS-tik and from the Greek "heuriskein" meaning "to discover") pertains to the process of gaining knowledge or some desired result by intelligent guesswork rather than by following some preestablished formula.
Hewlett Packard Enterprise (HP Enterprise, HPE) - Hewlett Packard Enterprise (HP Enterprise, also known as HPE) is an American multinational company that specializes in business IT (information technology).
Hewlett-Packard (HP) - HP (Hewlett-Packard) is a prominent IT company based in Palo Alto, California.
hexadecimal - Hexadecimal is a numbering system with base 16.

HIB - HSP