A poker player is drawing if they have a hand that is incomplete and needs further cards to become valuable. The hand itself is called a draw or drawing hand. For example, in seven-card stud, if four of a player's first five cards are all spades, but the hand is otherwise weak, they are drawing to a flush.
The main types of draw in poker are the straight-draws and flush-draws. Straight-draws are usually broken down into open-ended straight-draws and gutshot or inside straight draws.