A coroutine is a computer program component that generalizes subroutines for non-preemptive multitasking. Coroutines allow multiple entry points for suspending and resuming execution at certain locations. They are useful for implementing things like iterators, state machines, and asynchronous I/O operations. Unlike threads, coroutines are typically executed within a single thread, avoiding the overhead of context switching and synchronization primitives associated with threads.
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