What Is Three-Tier Application?

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In the case of a three-tier architecture, the middle tier is the most important. It is responsible for ensuring that all data and processing are handled efficiently. It means it has to be able to communicate with both the top and bottom tiers without any lag or hiccups. A three-tier request is a specific type of n-tier architecture. In the case of a three-tier building, the first tier is the UI or user interface. It is where users interact with your application to provide input and receive output. The second tier is business logic, where the bulk of the work gets done. This tier handles calculations and data manipulations on behalf of the user interface and communicates with other tiers as necessary to complete requests. The third tier is the data layer or database server, which stores information required by both tiers and any additional data that other applications or users might need. The three tiers are like a band of brothers, but with less murder and more, well, everything else. The three tiers are approximately coupled with predetermined and stable interfaces. It will decouple, allowing significant changes to occur within each tier's design, implementation and scale without impacting the other tiers. In short: they can change whenever they want! This loose coupling provides stability by ensuring that any changes in one tier do not affect the others. The Data Tier is free to evolve as needed, while the Application Tier only needs to use its input and output interfaces provided by the Data Tier. Likewise, the Business Logic Tier can be modified without affecting the other two tiers. If you've ever wanted to replace one tier of your application without affecting the others, then a three-tier application is for you. It also helps you separate business-related functions from database-related ones, which means that if you have a database problem, it won't affect how your business works. Finally, a three-tier application significantly increases system load balancing and scalability for performance.

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