1Tier, 2 Tier & 3 Tier Architecture

1 Tier Architecture::



All the processing is done on only one machine,& number of clients attached to this machine.(MainFrame)



2 Tier Architecture ::



Client & Database is on different system.

Processing is done at client side.

Application layer is at client side.



3 Tier Architecture ::



Apart from Application & database layer there is one more layer present at client side.(eg Browser).

First tier= presentation tier

second tier=Application Tier(Business Logic)

Third Tier=Data Tier(Database Server)