Alt+Tab is a shortcut key most often used to switch between open programs in Microsoft Windows and other operating systems.
To switch between open tabs in the active window, use the keyboard shortcut Ctrl+Tab.
How to use the Alt+Tab shortcut key
Alt+Tab in Microsoft Windows
In Microsoft Word, pressing Alt+Tab moves from left-to-right in the available open windows.
If you press Alt+Shift+Tab, it would move right-to-left in the available open windows.
Use the Alt+Esc keyboard shortcut if you only have two or three windows open to switch between open windows even faster.
Alt+Tab in Linux Mint
In Linux Mint, pressing Alt+Tab cycles through though the open windows.
Related keyboard shortcuts
Below are links to related keyboard key and keyboard shortcut pages.