Why do we need doFirst block in the gradle tasks?

Question

From my testing, both

task taskA {
    doFirst {
        println("$name first")
    }
    doLast {
        println("$name second")
    }
}

and

task taskB {
    doLast {
        println("$name first")
        println("$name second")
    }
}

executes in the same order.

What is the significance of having a separate doFirst block? Can something else happen between the execution of doFirst and doLast?

I have gone through the gradle docs section on tasks. The examples also seem to use just doLast