RAML stands for the RESTful API Modeling Language

RESTful API Modeling Language (RAML) is a simple and practical way of describing RESTful APIs.
It encourages reuse, enables discovery and pattern-sharing, and aims for merit-based emergence of best practices.
The goal is to help our current API ecosystem by solving immediate problems and then encouraging ever-better API patterns.
RAML is built on broadly-used standards such as YAML and JSON and is a non-proprietary, vendor-neutral open spec.