Starting with this update, the Contacts application will be available for download on all Android devices running Lollipop and above. Previously, Google Contacts was only available to Pixel, Nexus, Android One, or Google Play Edition devices via Play Store.
The compatibility with just about any Android device is the most important change included in the update, but it's not the only one. Google also announced that the update will allow Calendar users to merge duplicate contacts from within the contacts list.
Also, Google Calendar users will now receive automatic suggestions for adding info to their existing contacts. Once again, you can now find Google Contacts in the Play Store if you own an Android device powered by Lollipop or a newer version.