Contacts, called Address Book before OS X Mountain Lion, is a computerized address book included with Apple Inc.'s macOS.
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What is Contacts?
Contacts is a flexible and convenient place to store information for everyone you know. It’s easy to import names, numbers, addresses, and photos from Facebook, LinkedIn, Google, and even Microsoft Exchange. Contacts will automatically keep your friends’ and connections’ information and profile photos up to date. And iCloud updates your contacts on your Mac, iOS devices, and Apple Watch — so when you enter someone’s contact info once, you have it everywhere.