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multi tier architecture

eskay kumar
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I would like to clarify a basic question that concerns the existence of the application server as the middle tier
I read that -
A two tier architecture consists of a client and server where the business logic resides and is processed on the client side.
The need to have more light weight clients made way for the multi tier architecture. The introduction of the middle tier shifted the burden of the business logic to the middle layer.
Can someone please explain what you mean by business logic and give an eg.
also where can we clarify basic fundamentals like this. I have made a career shift into IT and i get stumped by my lack of technical knowledge in some of these areas.
thanks a lot
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