A potluck is like when you have a party with your friends and everyone brings a dish to share. It's like when you and your friends get together for a playdate and you each bring your favorite toy to share with each other. At a potluck, everyone brings a different food, like maybe someone brings a yummy cake, or someone brings a big bowl of macaroni salad. Everybody gets to try all the different foods and it's a fun way to share a meal and spend time with your friends.