Ansible Roles
Roles let you automatically load related vars, files, tasks, handlers, and other Ansible artifacts based on a known file structure. After you group your content in roles, you can easily reuse them and share them with other users.
Roles with Ansible Galaxy
A role enables the sharing and reuse of Ansible tasks. It contains Ansible playbook tasks, plus all the supporting files, variables, templates, and handlers needed to run the tasks. A role is a complete unit of automation that can be reused and shared.