I shop for for apps on my ipod touch and when i plug my ipod into itunes and it says erase and sync what does that mean?

hello all,
i normally shop on my ipod touch (because frankly i cant be bothered to plug it into itunes then shop! ) to shop for apps and song and etc. and because i have a wall charger in my room theres pratically no need to go the computer! so sometimes when im on the computer i want to use my ipod touch as well so i charge it on the pc.
well to cut the story short everytime i want to shop on itunes it comes up with this note that says "your ipod is synced with a different pc etc" then it comes up with erase and sync? so my question is what does syn mean? because im worried if i choose ok it would get rid of all my apps
- someone help me!

- It means what it says.  Your iPod is synced with a different iTunes library.  To transfer purchases to this computer:
iTunes Store: Transferring purchases from your iPhone, iPad, or iPod to a computer
- If you want to make this computer your syncing computer see ths previous discussion:
https://discussions.apple.com/thread/3362492?tstart=0

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