Can you explain what suspend functions are in Kotlin and how they work?

Suspend functions in Kotlin are functions that can be paused and resumed later without blocking the thread. They are used for writing asynchronous and non-blocking code.

Main points:

• Denoted by the keyword suspend.
• Can only be called from other suspend functions or coroutines.
• Allow performing long operations (e.g., network requests) without blocking the main thread.

Example:

suspend fun fetchData(): String {
    delay(1000) // pauses execution for 1 second without blocking the thread
    return "Data received"
}

Here, delay is a suspend function that pauses the coroutine, allowing other tasks to run during this time.