| Layer | Used For | 
| Web Application | Public facing site used by the user. | 
| WCF Service | Windows Communication Foundation (WCF) | 
| Facade | Serves as a front-facing interface masking more complex underlying or structural code. | 
| Business Object | Enable designers to design software in manageable pieces by breaking the business down into a modular form. | 
| Data Access Object | Provides an abstract interface to some type of database. | 
| Stored Procedure | Stored queries. | 
| Database | Data repository. | 
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