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 and supports scalars, sequences, and mappings, making it easy to write and understand for both humans and machines. It is widely used in DevOps, cloud computing, and application configuration due to its simplicity and readability.
Developers should learn YAML when working with configuration files for tools like Docker, Kubernetes, Ansible, or CI/CD pipelines, as it is the standard format in these ecosystems. It is also useful for data serialization in applications that require human-editable configuration, such as web frameworks or build tools, because it is less verbose than JSON or XML and supports comments and complex data types.