What is the difference between runBlocking and coroutineScope in Kotlin Coroutines?

Hello, colleagues! I started learning coroutines in Kotlin and came across two functions that seem very similar to me: runBlocking and coroutineScope. I read the documentation, but their behavior is still not obvious to me.

Here is an example I wrote:

fun main() = runBlocking {
    launch {
        delay(1000L)
        println("World!")
    }
    println("Hello,")
}

And another one:

fun main() = runBlocking {
    coroutineScope {
        launch {
            delay(1000L)
            println("World!")
        }
        println("Hello,")
    }
}

Both examples print "Hello," first, and then "World!" after a second. But I suspect there is a difference, and it is important. What is it?