Sorry to hear you are stuck with Linux. You have missed out on a multitude of what I refer to as Bill Gates Mysteries.
Oh well.
As to what a Task Bar is ... Here is a simple explanation:
A Bar is place that sells alcoholic beverages.
A Task is something you have to do but don’t really want to do, at least not right now.
So, a Task Bar is a place to go to and have a drink while you contemplate your unfinished or unstarted tasks.
lol