When your phone syncs, your Google apps refresh their data, and you get notifications about updates.
By default, apps made by Google sync automatically. You can turn auto-sync off and back on for individual apps.
Whether other apps (not made by Google) can sync varies by app.
To see if your other apps can auto-sync:
Review the list of accounts:
Turning off auto-sync doesn’t remove the app or your data. It only stops the app from automatically refreshing your data.
Turn off the apps you don’t want to auto-sync.
For example, sync your Calendar and Gmail but don't sync Drive.
Turn Automatically sync app data off 
To receive emails, calendar reminders, or other notifications from Google apps, you’ll need to sync manually.


Select an issue to see troubleshooting steps: