The basic functionalities of 3-Tier Model

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Fig Showing 3 Tier or N- Tier Client Server Model

In a three-tiered application, the presentation services are responsible for gathering
information from the user, sending the user information to the business services for
processing, receiving the results of the business services processing, and presenting those
results to the user. The most popular architecture on the web currently, mostly taking the
form of web browser processing client side presentation in the form of HTML/DHTML,
etc, the web server using some scripting language (ASP) and the database server (SQL
Server for example) serving up the data.

The basic functionalities of 3 Tier or N-Tier follows are

The presentation services tier is responsible for:

Gathering information from the user

Sending the user information to the business services for processing

Receiving the results of the business services processing

Presenting those results to the user