As a result, n-tier architecture and multi-tier architecture are usually synonyms for three-tier architecture.Software architecture is all about how a software system is built at its highest level. But applications with more than three layers are rare, because additional layers offer few benefits and can make the application slower, harder to manage and more expensive to run. N-tier architecture - also called or multi-tier architecture - refers to any application architecture with more than one tier. A simple contact management application, where users can enter and retrieve contact data, is an example of a two-tier application. In two-tier architecture the presentation tier - and consequently the end user - has direct access to the data tier, and the business logic is often limited. Two-tier architecture is the original client-server architecture, consisting of a presentation tier and a data tier the business logic lives in the presentation tier, the data tier or both. While three-tier architecture is easily the most widely-adopted multi-tier application architecture, there are others you might encounter in your work or your research.
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