YAML
In plain terms
A human-friendly data format using indentation.
Going deeper
YAML expresses structured data with minimal punctuation and indentation, popular for configuration files. It's more readable than JSON for humans.
Under the hood
Indentation-sensitivity and surprising type coercion ('yes'→true) cause subtle bugs; a JSON superset.
Examples
Kubernetes manifests, CI pipelines, Docker Compose, Ansible playbooks.
Think of it like...
Like a tidy outline with indentation showing what belongs under what.