What is the difference between QueryParameter and RequestParameter?

There is a very distinct difference between the RequestParameter and QueryParameter, even though they both look the same. When we talk about RequestParameter, we want to imply the part placed in the URL itself. Whereas, when we talk about the QueryParameter, we talk about the character in a URL. Even though the Request param vs. Query param seems to be vague, RequestParameter can return a QueryParameter.

You can take help from RequestParameter to get and read values from a form post. But a QueryParameter has nothing to do with the form values. It ignores the form values. Also, another difference between the two is that the RequestParameter can return more values compared to QueryParameters.