YAML is a human-readable data serialization format used widely in configuration files, APIs, and automation workflows.YAML, which stands for Yet Another Markup Language or YAML Ain’t Markup Language, is lightweight and easy-to-read.There is no functional difference between .yaml and .yml file extensions, with modern systems supporting .yaml as the preferred standard.YAML is widely used in DevOps, CI/CD pipelines, and cloud configurations due to its simplicity and flexibility.