.yml / YAML - Definition and Reference

.yml / YAML — Definition & Reference

YAML (short for YAML Ain’t Markup Language) is a human-readable data serialization format commonly used for configuration files and data exchange between languages with different data structures.

🔹 Key Characteristics:

• File Extension: .yml or .yaml
• Syntax: Indentation-based, minimal punctuation, and whitespace-sensitive

🔹 Relationship to JSON:

YAML is an official strict superset of JSON, meaning:

• Any valid JSON file is also valid YAML.
• YAML can do everything JSON can—and more.
• YAML supports additional features such as:
  • Comments (#)
  • Complex data structures (anchors, references, merges)
  • Multi-line strings and folded blocks

🔹 Interoperability:

• JSON can be converted to YAML without loss of data.
• YAML can embed JSON inside it.
• This makes YAML especially flexible for config files in ecosystems like Docker, Kubernetes, GitHub Actions, Ansible, and more.

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