The function keys are the top row of keys on the keyboard, normally labelled F1-F12.
By themselves they have no function - they are 'blank' spare keys meant for programs that want a place to put...
when you are writing in Word (or similar program) the home key will take you to the beginning of the line. Control+home will take you to the beginning of the document.
The function of the keyboard is to display what ever you want onto the screen there for having it be able to do anything. The keyboard consists of keys with letters and symbols on them that can be...