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AFC
AFC is a service (run by afcd) running on every iPhone / iPod, which iTunes uses to send files to the device. It is locked in the /var/mobile/media jail.
AFC2
AFC2 is a an additional AFC service, configured to allow access to the whole filesystem. Installing it and patching the fstab file for full write access is considered a bare-bones jailbreak. The AFC2 service is added by editing the /System/Library/Lockdown/Services.plist file and adding a service that runs under root with access to /.