Yet Another Markup Language - human-readable data serialization standard. Like a simple format for writing configuration files that both humans and computers can easily understand.
DevOps teams write Kubernetes deployment configurations in YAML format because it's easy to read and edit.
YAML is an open, vendor-neutral data serialization format (not a cloud service). All major cloud providers accept YAML in various tools (for example, Kubernetes manifests, CI/CD pipelines, and infrastructure-as-code templates).