Google Sync keeps your phone or mobile device in sync with your GMail, Google Calendar and contacts. But Google sync for iOS will bring you even more, now from your iPhone or iPad you can;
- Search all your emails, locally stored and on the server.
- Accept, decline and or edit Calendar events from the iOS Calendar App.
- Send emails from a selected email address, if you have multiple address' managed by a single Google Account.
For more information, visit Setting up Google Sync with your iOS device
Three new updates to Google Sync for iPhone and iPad - Official Google Mobile Blog