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3 Tier architecture is a client-server software architecture pattern in which the user interface (Presentation), functional process logic (business rules), computer data storage and data access are developed and maintained as independent modules, most often on separate platforms. 3 Tier architecture consists of Presentation Tier, Application Tier and Data Tier.
It is the topmost level of the application. It displays information related to such services as browsing, purchasing and shopping cart contents. It communicates with other tiers by which it puts out the results to the client tier and all the other tiers in the network
This tier is also known as business logic, logic tier, or middle tier. The logical tier is pulled out from the presentation tier and, it controls an application’s functionality by performing detailed processing.
This tier includes the data persistence mechanisms and the data access layer that enclose the persistence mechanisms and exposes the data. The data access layer should provide an Application Programming Interface (API) to the Application Tier that exposes methods of managing the stored data without exposing or creating dependencies on the data storage systems.
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