What is the simplest form of data representation in YAML called?

YAML, which stands for "YAML Ain't Markup Language," is a data serialization format that is easy for humans to read and write while also being straightforward for machines to parse and generate. In YAML, the simplest form of data representation is known as scalars. Scalars represent single values, such as strings, numbers, or booleans, and do not contain any hierarchical structure. This makes scalars the most fundamental building blocks in YAML, as they encapsulate simple data without the need for any additional syntax or structure.

For example, a string like "Hello, World!" or a number like 123 can be directly represented as scalars in a YAML document. Unlike lists, mappings, and sequences, which consist of collections or more complex data structures, scalars are the basic literal values that stand alone and serve as the foundation for creating more complex YAML structures.