What is YAML?

YAML (YAML Ain't Markup Language) is a human-readable data serialization format. It uses indentation for structure, supports key-value pairs, lists, and nested structures. Common in configuration files (Docker, Kubernetes, Ansible, GitHub Actions). YAML supports comments, multi-line strings, and anchors for reuse. Compared to JSON, YAML is more compact and readable but can have subtle parsing differences. YAML is a superset of JSON—valid JSON is valid YAML.