It only does one thing but it does it well.

The Right-Click, that is. If I had a diamond for every time I started this exhange:

"Ok, now click here."
"Right-click??"
"Nope, regular left-click"

I would be an incredibly happy woman. The right-click has one main* function - it's role in your life with Tech is to offer options via a menu. Go ahead. Try it. RIght click on this page; then right-click on your Start button. See that?  A menu filled with shortcuts that offer immediate access to handy functions.  Additionally, the short-cut menu's are  contextual (the offerings change based on where and what you are clicking).

* There are, of course, exceptions to this rule but thats for another day's post.