YAML
YAML (YAML Ain't Markup Language) is a human-readable data serialization language commonly used for configuration files, data exchange, and storing structured data. It uses indentation to denote structure, supports scalars (strings, numbers), sequences (arrays), and mappings (key-value pairs), and is often used in DevOps, cloud computing, and application settings due to its simplicity and readability.
Developers should learn YAML for writing configuration files in tools like Docker, Kubernetes, Ansible, and CI/CD pipelines, as it's widely adopted in modern infrastructure-as-code and automation workflows. It's also useful for data serialization in APIs and settings where human readability is prioritized over performance, such as in configuration management and deployment scripts.