What is what does short stack mean?

Short stack typically refers to a poker player who has a small amount of chips relative to the other players at the table. A short stack player is often in a vulnerable position and may have limited options when it comes to placing bets or making plays. In some cases, a short stack player may take on a more aggressive strategy in order to try and increase their chip count quickly, while in other cases they may need to play more defensively to avoid being eliminated from the game.