What is the presentation layer in SAP's 3-tier architecture?

The presentation layer is the topmost tier — it's what the end user actually sees and interacts with, typically the SAP GUI application (or, for newer applications, a web browser running SAP Fiori). Its job is purely to render screens, capture user input, and send requests to the application layer; it doesn't contain business logic itself.

flowchart LR
    A[User types data / clicks button] --> B[Presentation Layer]
    B -->|sends request| C[Application Layer processes logic]
    C -->|returns result| B
    B --> D[Screen updates for the user]

Because the presentation layer is lightweight and logic-free, users can run it from ordinary desktop computers or browsers without needing significant local processing power — the actual computational work happens on the application server, not on the user's own machine.

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