What is N tier and 2 tier architecture?

Question

Accepted Answer

N tier and 2 tier architecture are software architecture patterns used in designing applications.

2 tier architecture involves a client and a server, where the client directly communicates with the server.
N tier architecture involves multiple layers of servers, where each layer communicates with the layer above and below it.
2 tier architecture is simpler and faster, but less scalable and secure than N tier architecture.
N tier architecture is more complex and slower, but more scalable and secure than 2 tier architecture.
Examples of 2 tier architecture include desktop applications and simple web applications.
Examples of N tier architecture include complex web applications and enterprise systems.

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