What is Javascript prototyping, and how do you incorporate it into your web design plans?

As an experienced web architect, you've probably used prototyping methodologies in your work. Therefore, answering this question should be easy. When responding, make sure you follow the structure of the question. First, define JavaScript prototyping and then describe how you use it. This will make it easier for the interviewer to follow your answer.

"A Javascript prototype is an object associated with the corresponding Javascript functions and objects. The function's prototype property is accessible and adaptable but not visible to visitors to the site. This enables developers to create and test new features of the site in a production environment. A prototype's purpose is to create a sample, model, or release of a website feature to test the concept or process. I use Javascript prototypes for a variety of purposes, including semantics, design, and links to external resources."