What is Image-maps used for?

Question

Please help, I've never​ used it for my work and is interested...

Answer 1

To define different clickable zone on it, rather than the unique whole box element ^^

Answer 2

I wanted to do a Simon Says game with the SoloLearn logo but have some things to finish.
Note, I understand HTML5 changed maps so that you can do collision detection with them.

Here's a basic clickable map with the SoloLearn logo:
https://code.sololearn.com/WBJ8lS8yMplX/?ref=app

edit:
Rough zone cleanup + visualization. That should be enough for someone else to work with it if they want.