Explain the various implicit objects that are available?

Object	Class or Interface	Description
page	jsp.HttpJspPage	Page's servlet instance
config	ServletConfig	Servlet configuration information
pageContext	jsp.pageContext	Provides access to all the namespaces associated with a JSP page and access to several page attributes
request	http.HttpServletRequest	Data included with the HTTP Request
response	http.HttpServletResponse	HTTP Response data, e.g. cookies
out	jsp.JspWriter	Output stream for page context
session	http.HttpSession	User specific session data
application	ServletContext	Data shared by all application pages

The application, session and request implicit objects have the additional ability to hold arbitrary values. By setting and getting attribute values these objects are able to share information between several JSP pages.