Google Sync mainly used in Mobile phones and it began synchronising its free online calendars abd Gmail contact lists with smart phones using softwares licensed from arch-rival Microsoft.

Google Sync updates the Calendars and Gmail contacts in Iphones orWindow-based mobile devices to match changes users make using computers online and others ...

Sync uses "push technology" so many changes or addition to your calendar or contacts are reflected in your device in minutes,Google Mobile Engineer Bryan Mawhinney wrote in California's site.

It uses two-way service so that you make changes in Mobile and in Google account.

It goes by wireless connection, so that if phone gets lost the calendar and other information are storeb by Google.