Define Three-Tier Architecture?
The three-tier architecture has three-layers – the
Application-server, the client and the data server.
Application-server-tier: In this tier the
business-objects that implement the business rules are stored, and are
available to the client-tier. This level forms the central key to solving 2-tier problems. This tier protects the data from direct access by the
clients.
Client-tier: The client tier is responsible for the presentation of
data, receiving user events and controlling the user interface as the actual
business logic has been moved to an
application-server.
Data-server-tier: This tier is responsible for
data storage. Besides the widespread relational database
systems, existing legacy systems databases are often reused here.
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