Function keys are the keys along the top of a computer keyboard, usually numbered from F1 to F12. Each key is designed to make a particular thing happen when you press it.
[computing]
It's always worth consulting the manual to find out what the function keys do.
function key in British English
noun
computing
a key on the keyboard of a microcomputer, etc. that gives special commands to the computer
In other languages
function key
British English: function key NOUN
Function keys are the keys along the top of a computer keyboard, usually numbered from F1 to F12. Each key is designed to make a particular thing happen when you press it.
Just hit the F5 function key to send and receive your e-mails.