Version between Backports and non-backports

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http://crunchbanglinux.org – Hi, Im zeroblock join  #! like year ago,Today I want to download #! iso to install on my work PC and I saw their have two versions of iso installer.what is different between backports and non-backports?I have notice backports is using kernel 3.2, is that the only different?Sorry my bad English :(. (HowTos)