What is round-robin scheduling?

Question

In a multitasking operating system context, sometimes you hear the term round-robin scheduling. What does it refer to?
What other kind of scheduling is there?

Answer 1

An opinion. It seems that we are intertwining two mechanisms into one. Assuming only the OP's original assertion "In a multitasking operating system context" then

1 - A round robin scheduler always schedules the next item in a circular queue.

2 - How the scheduler regains control to perform the scheduling is separate and unrelated.

I don't disagree that the most prevalent method for 2 is time-slicing / yield waiting for resource, but as has been noted there are others. If I am not mistaken the first Mac's didn't utilize time-slicing, they used voluntary yield / yield waiting for resource (20+ year old brain cells can be wrong sometimes;).