Difference between Two Tier and Three tier Architecture

S.No Two-tier Architecture Three -tier Architecture
Client -Server Architecture
Web -based application
Client will hit request directly to server and client will get response directly from server
Here in between client and server middle ware will be there, if client hits a request it will go to the middle ware and middle ware will send to server and vice versa.
2-tier means 1) Design layer 2) Data layer
3-tier means 1) Design layer 2) Business layer or Logic layer 3) Data layer

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