How do you delete pre-installed apps on the Samsung Interpret (Virgin Mobile)?

I have a bunch of applications on this cellphone that I never use, such as Google Maps. I want to delete them, but I don't know how. I know how to delete applications that I installed, but it doesn't seem to let me delete applications that are pre-installed.
Okay, so I can't delete unless I "root" it. How do I "root" my phone? And what is "rooting"?
 
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