JSP makes implicit variables available to the script. These variables are used to gain information about the request, and to help form a response. They also expose some useful functionality.
Contains the request object.
Contains the response object.
State for the current page.
The current session. session is available only when the session directive is true.
The current application.
The buffered stream to the HTTP response.
The current servlet.
For error pages, the exception thrown from the broken page.