inbound link
An inbound link (also referred to as a back link) is a hyperlink on a third-party web page that points to a web page on your site. Inbound links are important for search engine optimization (SEO) because Google and other search engines see multiple, relevant inbound links to a page as a sign that the content on that page is useful.
There are a number of tools you can use to see the inbound links pointing to your website. Google's Webmaster Tools is a free tool you can use to see the inbound links pointing to your site. To view a sample of who links to your web page, run this query on Google: link:www.yourwebpage.com.
Continue reading about inbound links:
Learn more in a beginner's guide to SEO.
Watch a video about the importance of external linking.