In two tier architecture commonly known as , client manages the user interface, server manages
the database and business logic can be run either on client or the
server. Two-tier architecture is a fine solution for developers
but when we talk in terms of maintenance, performance, scalability,
processing and flexibility; it is not a reliable architecture.
Finally, to overcome the limitations of 2 tier architecture and
structuring software systems; n-tier architecture came into existence
with its much wider and consistent terms. N-tier applications or
architecture involves splitting the two tier architecture into multiple
tiers wherein the presentation layer, dynamic layer, business logic
and database access runs on separate layers allowing each layer
to perform the specific job. For example, allowing a Web server
to serve Web-pages, an application server to serve applications,
and a database server to serve databases.
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