A designated key, usually the F1 key, used to request online help information about what the cursor is currently on. Some keyboards have a dedicated Help key that may take the place of F1.
A Help key, found in the shape of a dedicated key explicitly labeled "Help", or as another key, typically one of the function keys, on a computer keyboard, is a key which, when pressed, produces information on the screen/display to aid the user in his/her current task, such as using a specific function in an application program.