What keyword is used in Kotlin to declare a suspended function?

In Kotlin, the keyword used to declare a suspended function is "suspend." This keyword indicates that the function can be paused and resumed later, allowing for asynchronous programming without blocking a thread. When a function is marked with "suspend," it can perform long-running operations, such as network requests or database queries, without freezing the user interface.

Using "suspend" enables structured concurrency and helps manage background tasks efficiently. For example, a function defined with the "suspend" modifier can only be called from other suspend functions or within a coroutine, ensuring that the execution context is appropriate for the suspension.

The other keywords in the list pertain to different concepts in Kotlin. For instance, "async" is used to start a coroutine that returns a result, while "await" is used to wait for the result of an asynchronous operation. "Launch" is a coroutine builder that initiates a coroutine but does not return a result. Understanding the "suspend" keyword is crucial for effectively implementing coroutines and managing asynchronous tasks in a Kotlin application.