JSP provides following 9 implicit objects.

out (javax.servlet.jsp.JspWriter)
request (javax.servlet.ServletRequest)
response (javax.servlet.ServletResponse)
session (javax.servlet.http.HttpSession)
pageContext (javax.servlet.jsp.PageContext)
config (javax.servlet.ServletConfig)
page (java.lang.Object)
application (javax.servlet.ServletContext)
exception (java.lang.Throwable)