How to clear out other category on my iphone 4s?

When i went to sync my iphone earlier today it showed over 3GB in the "other" category. What exactly is that category and what can i do to clear some of that out so i actually have room for things i want on my iphone 4s?

This website should help you out http://www.channel933.com/pages/1d/?l3

You can't clear it out. It's software.

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