YAML

YAML (/ˈjæməl/ ^ⓘ YAM-əl) is a human-readable data serialization language. It is commonly used for configuration files and in applications where data is being stored or transmitted. YAML targets many of the same communications applications as Extensible Markup Language (XML) but has a minimal syntaxthat intentionally differs from Standard Generalized Markup Language (SGML).It uses Python-style indentation to indicate nesting and does not require quotes around most string values (it also supports JSON style [...] and {...}mixed in the same file).

For more information, see Wikipedia.