Conditional Formatting

Conditional formatting is a set of rules.
But not just rules that you follow, not like the law and the constitution.
But its a law followed by cells.
Its a formula wherein you can use for example, to put the highest scorer's score in a test cell green.
It can be seen on the Home menu bar of Excel:

But take note that for conditional formatting, you should look if there are too much rules to be followed by a certain rule.