Ansible Galaxy is a galaxy website where users can share roles and to a command-line tool for installing, creating, and managing roles.
Ansible Galaxy gives greater visibility to one of Ansible's most exciting features, such as application installation or reusable roles for server configuration. Lots of people share roles in the Ansible Galaxy.
Ansible roles consist of many playbooks, which is a way to group multiple tasks into one container to do the automation in a very effective manner with clean, directory structures.