What are the implicit EL objects in JSP?

Following are the implicit EL objects:-
PageContext: The context for the JSP page.
Provides access to various objects for instance:-
servletContext: The context for the JSP page's servlet and any web components contained in the same application.
session: The session object for the client.
request: The request triggering the execution of the JSP page.
response: The response returned by the JSP page. See Constructing Responses.In addition, several implicit objects are available that allow easy access to the followingobjects:
param: Maps a request parameter name to a single value
paramValues: Maps a request parameter name to an array of values
header: Maps a request header name to a single value
headerValues: Maps a request header name to an array of values
cookie: Maps a cookie name to a single cookie
initParam: Maps a context initialization parameter name to a single value Finally, there are objects that allow access to the various scoped variables described inUsing Scope Objects.
pageScope: Maps page-scoped variable names to their values
requestScope: Maps request-scoped variable names to their values
sessionScope: Maps session-scoped variable names to their values
applicationScope: Maps application-scoped variable names to their values
For instance the below snippet will indentify the browser used by the client.<b>Browser:</b> ${header["user-agent"]}<br/>