Multitier architecture

1. https://en.wikipedia.org/wiki/Multitier_architecture
2. In software engineering, multi-tier architecture (often referred to as n-tier architecture) is a client–server architecture in which presentation, application processing, and data management functions are physically separated. The most widespread use of multi-tier architecture is the three-tier architecture.
3. Three-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.

Multitier architecture

原文：http://www.cnblogs.com/dmdj/p/4847389.html