Like all versions of Rummy, it is a draw-and-discard game.
There are other versions of Gin that can be played with more than two, but the basic game is two-handed. Gin Rummy is actually just like “Knock Rummy,” but it is played by only two people. Remember for all games of Rummy: A group is three or more cards of equal rank (same card of different suits, like three 4s or four 6s) and a sequence is a series of three or more cards of the same suit in order.