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What is the difference between an attribute and a parameter?
Request parameters are the name/value pairs, and the result of submitting an HTML form. The name and the values are always strings. For example, when you do a post from html, data can be automatically retrieved by using request.getParameter() at the server side. Parameters are Strings, and generally can be retrieved, but not set. 
Attributes are objects, and can be placed in the request, session, or context objects. Because they can be any object, not just a String, they are much more flexible. You can also set attributes programatically using setAttribute() method, and retrieve them later using getAttribute() method.