How is YAML structured compared to JSON?

YAML is a human-readable data serialization format that allows comments, which can be very helpful for documentation or annotations within the data itself. This is a key feature that differentiates YAML from JSON, as JSON does not support comments. By allowing comments, YAML makes it easier for developers to maintain and explain configurations or data structures without altering the actual data being represented.

Other options present inaccurate comparisons or characteristics of the two formats. For instance, YAML does not rely on brackets or indentation to define data structures; instead, it uses indentation to signify hierarchy and relationships between elements. Also, YAML can be hierarchical just like JSON, constructing complex structures through indentation rather than a flat approach. Lastly, both YAML and JSON utilize commas for separation in lists, and neither uses semicolons in this context, which makes that choice incorrect as well.