Tabbed browsing is a form of Internet navigation that allows a user to browse multiple web pages in a single window. These additional pages are denoted by tabs at the top of the browser window. This feature is for users who do want to view multiple sites, but don't want to have multiple browser windows open. In the image to the right, you can see that the Mozilla Firefox 1.0.7 window has two tabs open, near the top of the browser window.
Helpful tips about tabbed browsing
Use the keyboard shortcut key Ctrl+T to open a new tab. You man open any tab that you had previously closed by pressing Ctrl+Shift+T.
To close a single tab at a time in most Internet browsers, press Ctrl+W on your keyboard or click the X on the right side of the tab.
To move forward between tabs, press Ctrl+T on your keyboard. To move to the previous tabs, press Ctrl+Shift+T.
Below is another image that shows how Internet tabs may look. In this example, you can see two tabs open in Google Chrome. Clicking either of these two tabs would switch between the open pages.