An active tab is the tab currently being used. For example, if you have multiple tabs open in your browser since you're reading this page, it would be considered the active tab. Any other tabs that may be open would be considered an inactive tab.
As shown above, when a tab is active it may be a darker color and have an appearance of being on top of all other tabs. In the picture above, the Computer Hope tab is the active tab, and YouTube and the Google search tabs are inactive.
To change between tabs, click on the tab you want to become active. You can also use any of the below shortcut keys when working with tabs in most programs.
Ctrl+Tab - Switch between open tabs.
Ctrl+Shift+Tab - Switch between open tabs in the opposite direction.
Ctrl+T - Open a new tab.
Ctrl+Shift+T - Open a closed tab.
Ctrl+F4 - Close the active tab.
See our tabbed browsing definition for further tips and information about tabs in browsers.