What does 'mate in one' mean in chess? Apparently, I've done it

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White to move, is this a draw? Or a forced mate : r/chessbeginners

What does 'mate in one' mean in chess? Apparently, I've done it many times since my buddy keeps telling me it's my favorite checkmate move? - Quora

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In this position, (black to move) Qe1 is apparently checkmate, but I am confused because the rook is pinned and therefore cannot defend the queen. Can someone explain this to me?

What's a 'quiet move' in chess? - Quora

What does 'mate in one' mean in chess? Apparently, I've done it many times since my buddy keeps telling me it's my favorite checkmate move? - Quora