Prototyping facilitates the actual feel of the real product with an embryo of an idea, sees it and gives meaningful decisions about its design and functionalities.

It gives clients the chance to present prototypes to stakeholders or end-users in order to gather important feedback early in the development process.

Prototyping would help a client to validate assumptions or hypotheses about the behavior of their prospective users. By observing the way the users use the prototype, a client proves his idea.

It mitigates one of the common risks during product development: probable problems in the actual development process of a product are realized too late, when it is either costly or impossible to make a change.

These prototypes talk to the client and to the designer and the developer in a way so as to make all three of them realize the same thing. This avoids all sorts of confusion and thus provides a platform for healthy collaboration.

Since the flaws in designs and usability problems are identified and cleared in the beginning, prototyping saves time and cost for the clients from the rework involved.