The JSP specification defines several implicit variables that are not necessary to declare.Implicit variables or objects can only be used within scriplets and expressions.They provide a simplified way to access the Servlet API.You can use these variables to write response headers,retieve posted from data, track sessions, and handle exceptions.
Implicit JSP variables are :
Request - Retrieves all the information that is sent from a Web browser to a Web server.
Response - Sends information back to the Web browser.
Session - Stores and retrieves session information for each visitor to your Web Site.
Exception - Provides an exception handling mechanism.
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