What is teo tier?

Two tier refers to a software architecture that divides an application into two separate layers or tiers.

The first tier is the client-side or presentation layer, which is the user interface that interacts with the end-users.

The second tier is the server-side or application layer, which is the back-end part of the application that processes requests and provides data to the client.

In a two-tier architecture, the server runs both the application and the database system, which can limit scalability and availability.

Two-tier architectures were popular in the past, but have been largely replaced by more scalable and distributed architectures such as three-tier and microservices.