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2-Tier Architecture:
Some of the earlier mission-critical client-server applications such as ERP used a two-tier architecture in which application processing is split into two parts between the client workstation and the server. The client runs the presentation and the majority of the application logic. The server stores the information on a database and also runs some application logic. This is often referred to as “fat client?architecture.

3- Tier Architecture:
In a 3-tier model, the presentation, application, and the database all reside on separate computers. In the 3-tier architecture, application logic is detached from the actual database, allowing for specialized application servers to be deployed using a standard interface to database servers. Since the database servers are a separate entity, they can become a shared resource among multiple applications. This model increases both manageability and portability of both the application and database tiers.

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