N-Tiered vs N-Layered architecture/design -

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What does it mean with n-tierd and n-layer architecture / design?

Is there any difference between N-Tiered and N-layered architecture / design?

If so, what's the difference?

People often use two words interchangeably between each other, in which they describe an architecture As both are multi-layered and multi-tiered. I believe that usually a level refers to some physical separation, whereas one layer is more than a logical separation.

For example, I say a specific web application that there is a front end - which is displayed in browser - and the actual application logic running on the application server and a database. It can be referred to as 3 tires, since there is a database server, an application server and a client machine. Just as easily, however, a database layer, logic level and presentation (or UI) can refer to the layer.


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