YAML syntax is similar to other high-level languages and can easily represent lists, hash tables, and scalars. It uses whitespace indentation and heavily relies on appearance, making it especially suitable for expressing or editing data structures, various configuration files, debugging output, file outlines (e.g., many email header formats are very close to YAML). Although it is more suitable for representing hierarchical data structures, it also has delicate syntax to represent relational data. Because YAML uses whitespace and line breaks to separate data, it is particularly suitable for operations with grep/Python/Perl/Ruby. Its most user-friendly feature is skillfully avoiding various enclosing symbols such as quotes and various brackets, which can become complex and hard to identify in nested structures.