This is the directory that holds your models. In Sails, models are the structures that contain data for your Sails App.
When you call
sails generate api cats via the command line from inside your project's root directory, Sails will generate the file
api/models/Cats.js as well as a matching controller. In the
api/models/Cats.js file you can specify the attributes which determine how the records in your database will be defined.