Explain what a YAML file is and what it is used for.

YAML (YAML Ain't Markup Language) is a human-readable data serialization format, often used for configuration files.

Main features of YAML:

• Easy for humans to read and write
• Uses indentation for nesting, similar to Python
• Supports lists, dictionaries, and scalar values

It is used for storing application settings, describing infrastructure (for example, in Kubernetes), CI/CD pipelines, and other tasks where it is important to describe data structures conveniently and clearly.

Example of a YAML file:

server:
  port: 8080
  host: localhost
features:
  - login
  - signup
  - dashboard