hi,
Page Scope is the smallest scope, and is a representation of the PageContext object for your JSP. Each JSP has it's own page scope, so objects in the page scope of one JSP are not accessible to other JSPs. This is sorta like making a private variable in Java.
Request scope is the next smallest scope, and is represented with the JSP's request object. All JSPs and servlets that share a request share the request scope. For example, if I have a JSP that forwards to another page, and that second page includes a third JSP page, then all three pages are in the same request, and can share objects through the request scope. A special note here, is the response.redirect(), will create a new request, unlike forwards and includes. Also note, a new request is made every time the user gets a new page, be it by clicking a link, a button, or some JavaScript call.
http://www.coderanch.com/t/291025/JSP/java/difference-page-request
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