Will this software update erase all my data?

I got an iphone 4 and it wants me to do a software update. I remember doing those on my ipod and it would erase all my apps abd music and stuff. If i do it on my iphone will it do that? If so how do i get it not to?

Updates do not erase anything. They update the iOS files and do not touch your other stuff. Do not interrupt it until it has completely finished updating. It can restart several times during the update process so do not be tempted to interfere with it.

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