HI EVERYBODY,

The difference between 2 tier and 3 tier are as follows:

1.In 2 tier there are only client and server at the other side in 3 tier there are client ,server and middle tier.

2. It's not good enough that your end-to-end performance be good, it's also important that those machines service requests quickly, which is where a two-tiered architecture fails (and which is why people came up with the idea of a three-tiered architecture in the first place). This is the difference between performance and scalability.