Coroutine Builders

Coroutine builders in Kotlin are functions that start a new coroutine. They bridge the gap between regular, blocking code and the non-blocking, concurrent world of coroutines. Common builders include launch, which starts a coroutine without blocking the current thread and returns a Job, and runBlocking, which blocks the current thread until the coroutine completes, primarily used for testing and main functions. Another builder, async, starts a coroutine and returns a Deferred object, which represents a future result. These builders allow you to execute code concurrently and manage the lifecycle of coroutines.