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YAML Ain’t Markup Language is a data serialization language. It is used to transfer data between applications and services which have different data structures. It uses Unicode printable characters, some of which provide structural information and the rest contain the data. It has clear formatting which makes it human-readable, easy to use, and is easily implemented. It minimizes the number of structural characters and allows the data to be represented in a meaningful way. For example, indentation is used for structure, key-value pairs are separated by colons, and dashes are used to create bullet lists.