What is the significance of "all in" in poker and how does it impact the game?

In Poker, going "all in" means betting all of your chips. It is a significant move because it can either lead to a big win or a big loss. Going all in can impact the game by putting pressure on other players to make a decision, as they must either match the bet or fold. It can also change the dynamics of the game by potentially eliminating players or creating a larger pot to compete for.