A Job in Kotlin is defined as what type of unit?

A Job in Kotlin is defined as a cancellable unit of work performed by a coroutine. This means that when you initiate a coroutine, it is represented by a Job, which allows you the ability to cancel the execution of that coroutine if needed. Cancellation is an essential feature in concurrent programming, enabling developers to manage resources efficiently and prevent unnecessary computations when they are no longer needed.

Jobs also track the state of a coroutine, including whether it's active, completed, or cancelled, providing useful functionalities for coroutine management. The ability to cancel work makes coroutines flexible and more controllable in applications, especially in scenarios where long-running tasks might need to be interrupted gracefully in response to user actions or other system events.

The other potential answers would not reflect the true nature of how Jobs operate within Kotlin's coroutine framework. For example, a non-cancellable unit of work would contradict the principle of Jobs allowing cancellation, while being single-threaded or merely a unit of computation does not capture the full capabilities and characteristics of how Jobs function within the coroutine context.