attribute - is a member of a class
parameter - is a member of a method signature

argument - is used to send values to the method from the caller.
parameter - is a place holder for the incoming values for a method from the caller.

Attribute is the value we pass to the calling function. Parameter is the list of variables we use in a function.

1. Attributes are of the following types:Session attribute,Request attribute, Context attribute. Parameters are of the following types:Servlet parameters,Request parameters,Context parameters.
2. The attributes are set using the setAttribute() method. Parameters are set in the deployment descriptor using the <param-name> and <param-value> elements.
3. Attributes are obtained using the getAttribute(String name) method. Parameters are obtained using the getParameter(String name) method.
4. The attributes are returned as Objects.The parameters are returned as Strings.

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