Coroutine
A coroutine is a programming concept referring to a function or routine that can pause its execution and yield control back to the caller, and later be resumed from where it left off. Unlike traditional subroutines or functions that run from start to finish, coroutines have multiple entry and exit points, enabling cooperative multitasking or asynchronous processing. Coroutines can be implemented using a variety of techiniques, each offering different levels of control, complexity, and performance.