it means whatever is in your iTunes would be synced to your iPod. so sometimes you have songs in your ipod that is not on itunes. and when you sync it with itunes, it wipes out whatever is in your ipod. yes.
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Sync means that it is downloading the content that you have selected into the device that is connected to your computer and itunes.
Hoped it worked.
it means to upload what you put on the ipod to the computer and to download the songs from your itunes to your ipod