YAML

YAML is a data format designed to be easy for people to write and read, and it is widely used for configuration files. Instead of brackets and quotes, it uses indentation to show structure, which makes a well-formatted file pleasant to scan. It represents the same core ideas as JSON — mappings, lists, and scalar values — and in fact any JSON document is also valid YAML. Its readability comes with a catch: because indentation is significant, mixing tabs and spaces or misaligning a line can change the meaning or break the file, so consistency matters.