You can use iTunes to sync the contacts and calendars from your computer to your iPod, iPhone, or iPad. iTunes also syncs this information from your device to your computer—for example, if you add contacts on your iPad, syncing adds those contacts to your computer’s Contacts.

Note: If you use OS X 10.9.5 or later, you can sync only contacts and calendars. Other types of info are updated on your computers and iOS devices via iCloud. See iCloud Help.