The description of Contacts

Back up your contacts and sync them across all your devices
• Safely back up the contacts in your Google Account to the cloud
• Access the contacts in your Google Account from any device

Keep your contacts organized and up to date
• View your contacts by account (e.g., work vs. personal)
• Easily add contacts and edit information like phone numbers, emails, and photos
• Get suggestions for adding new contacts, cleaning up duplicates, and more

Contacts is currently only supported on devices running Android Marshmallow and above