Is N-Tier Architecture only the physical seperation of code or there is something more to it?

Posted by Starx on Stack Overflow See other posts from Stack Overflow or by Starx
Published on 2010-05-29T04:30:40Z Indexed on 2010/05/29 4:32 UTC
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Is N-Tier Architecture only the physical separation of code or there is something more to it?

What sorts of coding do we put in Presentation Layer, Application Layer, Business Logic Layer, User Interface Logic, Data Access Layer, Data Access Object,?

Can all the layers mentioned above give a fully functional N-tier architecture?

For example:

Whenever a user clicks a button to load a content via AJAX, they we do coding to fetch a particular HTML output and then update the element, so does this JavaScript coding also lie on a different tier? Because If N-tier Architecture is really about physical separation of code, than i think Its better to separate the JavaScript coding also.

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