Sync means copying new apps, music, video, or books from iTunes to your phone, or from your phone to iTunes. You can think of it this way: backup saves a copy of stuff you've created, and sync copies media you have downloaded via the iTunes Store.
Backup copies everything, but Sync only copies what you choose through iTunes. By default, it copies everything, but you can fine tune it all you want. You might want to stop movies from syncing to your phone if you never use it to watch movies, for example. Unless you've changed the settings, when you connect your iPhone to your computer, iTunes always performs a backup first, then a sync. When you connect a new iPhone to your computer, iTunes will offer to reconfigure it using the latest backup it has.
Syncing your iOS device with iTunes allows you to copy information more detailed list below to your iOS device from you computer and vice versa. Here is an Apple support article on backing up your iOS device which provides more details. When you connect your iOS device to your computer it will perform a backup before it will continue to sync automatically.
A backup saves all the information on your iOS device to your computer so that if you get a new iOS device or in your case an iPhone 5 your computer will ask you if you would like to perform a restore which will copy all of your settings from your old device to your new device. And here is another Apple support article about syncing your iOS device. Copies new data from your iPhone or other device to iTunes and removes deleted data.
Also does the same backwards from iTunes to your device. So to answer your question, yes things might change here and there, but only to make the devices "match" each other in the end. Simply creates a "snapshot" of your device. Can be used to "roll back" your device to this state if it acts wacky one day. Of course you should do this only when your device is feeling awesome and shiny or before you give it to your 2-year old niece to mess up all the apps in it.
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Jul 7, PM in response to socrmom In response to socrmom Hello socrmom. If I'm understanding correctly, you have questions regarding the process of syncing with iTunes. I will be happy to help. Take a look at the steps below to see if it helps, from our article: Sync your iPhone, iPad, or iPod touch with iTunes on your computer using USB After you turn on syncing for a content type, you'll see additional options to customize your sync settings.
Repeat steps 4—6 for each content type that you want to sync. Click the Apply button in the lower-right corner of the screen to save your sync settings.
If syncing doesn't start automatically, click the Sync button.
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