Magnolia 5.3 reached end of life on June 30, 2017. This branch is no longer supported, see End-of-life policy.
The Contacts module installs the Contacts app that allows editors to create an address book of contacts.
The Contacts module is bundled with Magnolia and typically already installed. You can download it from our Nexus repository
Contacts is a Community Edition module. It is typically already installed. Launch the Configuration app and go to /modules/contacts
to check.