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by earl, 6735 days agoA software architecture that divides the presentation (user interface), application logic, and data storage into three distinct layers. Each layer or tier usually resides on a different virtual machine. The presentation layer only communicates with the application or middle layer, which contains the business objects. The middle layer handles the applications processing logic and in turn communicates with the data access layer, such as SQL server. A three-tier application allows the implementation of thin clients and is much more flexible and easy to maintain than a two or one-tier. For example, the data storage layer can be substituted completely without having to change a single line of code at the client side (presentation layer).
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