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Que. Why web applications are stateless web application by default?
What is stateless:(During a session if web application is not capable of remembering client data across the multiple request's then its called as "STATELESS BEHAVIOR" of web application.)

Answer: Web applications are stateless by default because the
protocol HTTP is given as stateless protocol.

(Again the question might have raised in your mind i.e why Protocol HTTP is given as stateless: )

According to this stateless protocol for every new request to the web application of server, from browser window(client), one new connection will be created between browser window and server(web appl'n) and that connection will be closed automatically once the request related response goes/sent to browser window from web application.

Due to this one connection related request data is not visible and accessible while processing another connection related request given by client/browser window.

This above whole discussion denotes that, Web server always treats browser window as "new client for each request" even though same browser window is giving multiple request's to same server web appl'n.