Configure sync options
You can configure synchronization options for any of your apps. You can also decide what kinds of data to synchronize for each account.
To reach settings for Google accounts, start from 
Settings >
Accounts > Google.
For some accounts, syncing is two-directional; changes that you make to the information on your device are made to the copy of that information on the web. Your Google Account works this way. Other accounts support only one-way sync: the information on your mobile device is read-only.
Some apps, such as Gmail and Calendar, have separate synchro- nization settings that provide more fine-grained control. For ex- ample, to control message syncing in the Gmail app, touch 
Menu > Label settings > Sync messages. In such cases, the set- tings you select at the account level are still valid.
Configure auto-sync for all apps
To control Anto-sync for all apps that use it, open Settings > Data usage > Menu and check or uncheck Auto-sync data.
If you turn off Auto-sync, you need to sync manually to collect messages, email, and other recent information, and won’t receive notifications when updates occur. For example, changes that you make in your People app are automatically made to your Google contacts on the web.
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