## Roles

Organize tasks into reusable roles:

```yaml
- name: Deploy web app
  hosts: webservers
  roles:
    - common
    - python
    - nginx

# Example role structure:
# roles/
#   common/
#     tasks/main.yml
#     vars/main.yml
#   python/
#     tasks/main.yml
#     vars/main.yml
#   nginx/
#     tasks/main.yml
#     vars/main.yml
```