Closing credits are like the end of a book or movie where you get to see who all helped make it. Just like how you thank your mom and dad for helping you build a sandcastle, movies and TV shows also like to thank the people who helped them make the show or movie.
In the closing credits you will see a list of names of all the people who had a part in making the show or movie. This includes things like the actors who were in the show or movie, the director who helped tell the actors what to do, the writers who came up with the story, and even the people who worked on the costumes and special effects.
It's important to watch the closing credits to show appreciation to all the people who worked hard to make the show or movie possible. Plus, you may just see a funny joke or extra scene hidden in the credits.