A coroutine is like a very small program that runs inside a bigger program. You can think of it like a very small room inside a bigger house. The small room (coroutine) can be used to do special jobs that help the bigger house (program) to run better. When the small room (coroutine) needs help from the bigger house (program), it can ask for it and then go back to what it was doing. Coroutines help make programs easier to understand and help make them run faster.