After players are dealt their hole cards, 'placing the blinds' occurs. These are small forced bets that ensure every single pot has a small value and blinds are only placed before the first betting round. In Hold'em, the two players left of the button (in the case below players A and B) are obliged to place these small bets. Blinds must be placed. As the button moves before each round begins, so does the obligation to place these blinds. It is always the two players left of the button that pay the blinds and their value depends on how big a game you are playing.