Translation last updated: 17 Nov 2015.
This documentation is for LoopBack 2.x.
For the latest information, see the LoopBack documentation in English.
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A LoopBack model represents data in backend systems such as databases, and by default has both Node and REST APIs.  Additionally, you can add functionality such as validation rules and business logic to models.

Every LoopBack application has a set of predefined built-in models such as User, Role, and Application.  You can extend built-in models to suit your application's needs.   

Additionally, you can define your own custom models specific to your application: