The action of limping in poker describes entering the pot by calling instead of raising. For example, a preflop limping move is when you enter a pot for the price of the game’s big blind without raising.
Most poker players have the opinion that you should never limp and that raising is a much stronger play than limping.
Raising gives you a chance to seize control of the pot and have initiative after the flop. However, there is some merit to limping in poker on occasion to try and trap other players with a hand like pocket aces, especially in live games.