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A modern Java web application is commonly designed using a layered architecture, which divides the application into separate logical layers. Each layer has a specific responsibility and interacts only with the adjacent layers. This approach improves modularity, maintainability, scalability, code reusability, and ease of testing. By separating concerns, developers can modify one layer without significantly affecting the others. The four major layers are the Presentation Layer, Business Layer, Persistence Layer, and Database Layer. The Presentation Layer is the topmost layer that directly interacts with users. It is responsible for displaying information, collecting user input, validating basic data, and forwarding user requests to the business layer. This layer focuses on _____ _____ ______ _________ __________ ____.
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