Tab (GUI)

user interface component that allows multiple documents to be contained within a single window

On computers using graphics for an interface, a tab is a way to switch between different controls (such as in a configuration screen), or documents (such as in a web browser or word processor). Only one tab can be active at a time.

An example of tabs in gedit

Use in browsers

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More recently tabs have become a popular feature of most web browsers. This allows you to have more than one website open in the same window.

 
An example of Mozilla Firefox (version 2) with three tabs open.
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Other websites

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