What is Other in iPhone on iTunes library?

What exactly is "Other" in iTunes? About 3 weeks ago I got a white iPhone 5 and backed it up from my old 3gs phone and when I plug it up "Other" takes up like 4.5 gigs, is there any way I could minimize this. I tried a couple of different way but none of them worked so far, also not willing to do a complete restore, getting everybody's numbers and loosing all my pics isn't worth it.

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