What is the term/name used for the box that pops-up with words in it when using the cursor?

Question

Someone called it "alternative representation" but I'm not sure if that's the correct term or not. If you put the cursor on my name under my icon, it'll pop-up after a couple of seconds offering to look at my profile. Anyone know what the name of that is? I need to use it for a a file I'm programming.

Thanks.

Thanks to both of you...honestly I don't know which to vote as better.

Answer 1

I'm not sure if it's the same thing, but it could be an alt tag... that's probably what it stands for, alternative representation.

Answer 2

well, in programming, usually it's called a tooltip.