Professional wrestling is like a play where a group of people put on a show pretending to fight each other. Each person in the show has a job or role to play, called a "character." Some characters are good guys, or "babyfaces," and some are bad guys, or "heels."
When the wrestlers are pretending to fight, they do things to make it look real, like hitting each other in ways that don't hurt too much, and making noises to pretend like they're getting hurt. This is called "selling."
Sometimes, wrestlers will have a plan for how the pretend fight will go. This is called a "script." Some wrestlers might also have a plan for how they will act outside of the ring, like doing interviews or promos to talk about their character.
The process of making these plans and scripts is called "work." It's like the wrestlers are working together to make a show that is fun to watch and tells a story.
But even though the wrestlers are working together, they still want to make the pretend fighting look real. This makes the show more exciting and fun for the audience to watch.