Function key
（重定向自F keys）
![A 104-key PC US English keyboard layout with the function keys in orange.](/Images/godic/202501/13/Qwerty.svg5523.png")
![HP 9830A (1972) with 5×2 grid of 10 function keys at top left.](/Images/godic/202501/13/HP9830A-HP98665524.png")
![IBM 3277 (1972) with 3×4 grid of 12 Programmed Function (PF) keys at right.](/Images/godic/202501/13/IBM_3277_Display5524.jpg")
![KB United States-NoAltGr.svg](/Images/godic/202501/13/KB_United_States-NoAltGr.svg5524.png")
A function key is a key on a computer or terminal keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions, a form of soft key. On some keyboards/computers, function keys may have default actions, accessible on power-on.