What are the important tools of a three-tier client server?

In a three-tier or multi-tier environment, there the client implements the presentation logic or the client. The business logic is implemented upon an application servers and the data resides upon database servers.

The given below three component layers therefore define a three-tier architecture as:

a. A front-end component that is responsible for giving portable

b. Presentation logic;

c. A back-end component that gives access to dedicated services, as like a database server.

d. A middle-tier component that permits users to share and control business logic through isolating this from the actual application.