Uses of Function keys F1 to F12  on computer keyboard

When pressed, the F1 key activates the Help function.

F1

Pressing F2 allows you to rename selected files, folders or objects.

F2

Pressing F3 opens a search dialog box, for files, folders or text within a document.

F3

For closing the window, press Ctrl + F4; for shutdown, press Alt + F4.

F4

The F5 key is commonly used for refreshing or reloading.

F5

Pressing F6 in  web browsers and certain programs lets you quickly edit the website address or start a new search.

F6

F7 is used for spelling and grammar checking in word processors and text editors.

F7

F8 is used for booting your computer in  Safe Mode on Windows.

F8

F9 is used to apply refresh data in Excel.

F9

Pressing F10 in Windows opens the menu bar, allowing users to use the keyboard to access the menu options.

F10

F11 is commonly used to toggle full-screen mode in web browsers.

F11

F12  is used to open Firebug, Chrome Developer Tools, or other browser debug tools. In other apps, it have its own unique purpose.

F12