I have to write an essay in school on what is physics. I was wondering if anyone could help me out or refer me to some websites that would be able to help. Thanks.

There is a website www.physicsweb.org that should be of assistance to you. Go their main site and venture around a bit - but be sure to click on the tab titled "The Best of Physics Web" - this will bring you to an area that describes the different realms of physics as well as history, articles and lots of other information.

Good luck! If this does not help you or is not what you were looking for, please post another message and we try to redirect you.