PL/SQL to display all tables

Is there any PL/SQL to display the list of all existing tables in a DB?
SELECT TABLE_NAME FROM USER_TABLES will provide you with listing of tables in a particular schema. SELECT TABLE_NAME, OWNER FROM ALL_TABLES will provide you with listing of all tables for all schemas in the DB for which you have at least select privilege.

If you need table definitions you may need to tap into USER_TAB_COLUMNS and or ALL_TAB_COLUMNS data dictionary views.

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