Your computer's history is also known as your computer's cache.
Why do I need to do that?
Whenever you browse the internet, you leave clues about yourself and what sites you've been visiting. Other people can find these clues if you have not cleared your cache [history] or cookies.
How to clear your cache in Google Chrome:
How to clear your cache in Internet Explorer (IE):
How to clear your cache in Safari:
How to clear your cache in Mozilla Firefox: