HELP what is the Fn key for

can someone tell me what the Fn key is for and why I have to hold it down to make my keyboard work properly? Confused
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  1. Hello stephen1956;

    Fn key ( F u N ction key) works to activate a second function on a dual-purpose key.
    You can choose what mode the Fn key works in - normal or optional.

    Explain why you need to hold the Fn key down to "make the keyboard work properly".
    Has it always been 'that' way or is something new going on?
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