They just download a new version that the makers of the app have put out. Sometimes they make improvements or just add new features to the app.
If you jailbroke it by using cydia all the apps and cydia apps will get deleted
No, you do not. Everything will remain the same when you update your iPod when it comes to apps.
Yes. It's also free to update payed apps, that you already bought.
First you go to your app store. Next click on the tab "updates" under all apps. Then it'll show all your updateable apps. Choose 1 and hit "update", it'll ask you for your password. To update all those apps hit "update all" then type in your password. Hope this helps!
On the App Store where you gets your apps from hoped it helped
No, but in appstore you can just click update all, and it will do it for you.
mmm go to my documents/music/itunes/mobile applications delete the apps directly from that folder to prevent them from syncing back to your device
Yes I believe they are free
some people tell me that it automatically installs awesome apps and others say that it will erase some of your imformation what's so ever
It means that you need to update either your software or apps depending on what the message is asking you to update.
Open up your Library to the Apps tab then hit Check for Updates.
When you update your iPod 4gen it should not screw up your iPod. You apps will still be there.