In the Apple world, why does 'Sync' mean 'Erase' ??

I have some photos on my iPod, and a few applications. When I try to 'Sync' at work, iTunes 8.0.1 tells me that it will erase the content on the iPod and 'Sync' it to the current iTunes library, which does not contain any photos or apps.
Why does 'Sync' mean 'Erase' and is there a way around this?
I'm fine not syncing the photos, but I want to be able to add applications to the iPod from my work machine, and dragging the app icon from the iTunes Library to the iPod does not work.
Work computer is authorized...

Sync means sync. But it's a one-way sync, not two-way. That is, iTunes will, if it's set to automatic, sync your library to your iPod making it identical to the content on your computer. By demand of the content owners, way back when the iPods first came out (who by some ludicrous logic feared that it would promote piracy if it was easy to get tracks back off an iPod), though, the reverse isn't the case; iTunes will not sync your iPod back to your library on your computer (except for content purchased from the iTunes Store and for that there's a command; it doesn't happen automatically).
If you want to connect your iPod to more than one computer's iTunes library, set things up for manual control:
Managing content manually on iPod
Regards.
Message was edited by: Dave Sawyer

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