JSON (JavaScript Object Notation) is a lightweight data interchange format that's easy for machines to parse and generate. It's widely used in web APIs, configuration files, and data storage. JSON uses a simple syntax with key-value pairs and arrays.

YAML (YAML Ain't Markup Language) is a human-friendly data serialization format designed to be more readable than JSON. It uses indentation instead of brackets and supports more complex data types. YAML is commonly used for configuration files like Docker Compose, Kubernetes manifests, and CI/CD pipelines.

Both formats have their strengths: JSON is better for data interchange and APIs, while YAML excels at configuration files where human readability is paramount.

• Use JSON for: APIs, data interchange between services, configuration files for Node.js/JavaScript applications
• Use YAML for: Kubernetes manifests, Docker Compose files, GitHub Actions, Ansible playbooks, general configuration