How does the side pot work in poker and what are the rules surrounding it?

In Poker, a side pot is created when one or more players go all-in and have different amounts of chips. The main pot is for the player with the smallest stack, while the side pot is for the players with larger stacks. Only players who contributed to the side pot can win it. The rules surrounding side pots ensure that each player has a chance to win a portion of the pot based on their contribution.