Layered Architecture is commonly using when design website based on J2EE application and therefore is widely known by most architects, designers, and developers. The layered architecture pattern closely matches the traditional IT communication and organizational structures found in most companies, making it a natural choice for most business application development efforts.
One of the powerful features of the layered architecture pattern is the separation of concerns among components. Components within a specific layer deal only with logic that pertains to that layer. Following is the example of 4-tier architecture. It can be simplified to 3-tier or 2-tier by the case.