Limits are of three types: no-limit, pot-limit, and fixed limit. In no-limit, a player can bet or raise any amount, including full-stack when it is his/her turn to play.  Pot limit applies to poker games with the pot-limit structure where a player can bet or raise any amount, including the entire pot that he/she has at that time.  Fixed limit, on the other hand, only applies to poker games with a limit betting structure, which limits every player to bet or raise the fixed amount as declared before the game starts.