Management Project Software - What is the utility of developing a prototype in a Software project? Mention few applications.?

What is the utility of developing a prototype in a Software project? Mention few applications.?

What is the utility of developing a prototype in a Software project? Mention few applications where the development of prototype is not useful. Justify your answer.

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http://www.ignou.ac.in/virtualcampus/bit_studymaterials/8thtrimester/CST-204(structure)1.doc Isn't this an assignment question?
Software Prototypes - Software prototypes are useful when interacting with customers regarding the "look", "feel" and "functionality" of a proposed software application. Typically, Business Tracking and Analysis software is a very good candidate; Any application that is used by a large group of end users (e.g. software used on 911 systems by police and fire departments.) Software that does not prototype well are programs like language compilers, Translators, and any piece of software that does not require ANY input from human beings. Is this a homework assignment question?