As it says in Colossians 2:12, when you’re baptized, you’re “buried with [Christ] in baptism” and “raised with Him through faith in the working of God, who raised him from the dead.”
Simply put, it’s a public declaration that you’re on team Jesus now, and that you’re committed to his bride, the local church. It's a big deal. If you have not yet been baptized and want to be, you've come to the right place.