What is the use of "macro" key on keyboard

I believe the macro key is used as a sort of shortcut access button. You can exchange other key strokes that you use often for this macro key. It is used a lot in gaming.

I don't know about a key like that, I don't have anything like that, on my keyboard where would that key be located on the keyboard? I don't see it, I guess all keyboards are not the same.

i have checked my keyboard again to find macro key on it, but as it was going to happen i didn't find any key named macro on my keyboard. i think i never seen this key in any keyboard i used.

I don't see "macro" in my keyboard but I see "Fn", I think it's other key which can use for calling program with just pressing two key macro+w as example to run MS Word.

i think you are referring to the macros which can be made & used in microsoft word or excel softwares.