Prototype ,Sketches and ,Mock-up

The passage talked about a lot of example of prototype, and some traditional way of prototyping.

sketches, and mock up and Why should we prototype through whole designing process?

I want to talk about  it from previous working experience.

When I have an internship for the company I worked for,  we usually talk  to  the customer about our idea  by prototype. The same as the author said,  prototype helps us to develop understanding about the essence or essential factors of and existing experience. Firstly, as a designer works in a real word , you can’t replace the talk with the customer by anythings. By prototyping or present sketches, our customer will provide us valuable feedback and no matter how much you sit around and think of ideas or possibilities, you can’t replace talking to customers. They will say things you think make no sense and give some suggestion or even more, they will provide you a reason that they won’t by and maybe that’s the reason you never think of.  Prototype  or sketches or a will save us time & money in the long run for a project. Prototyping and sketches or a mock up are the  proof of our original concept models,

On the other hand,   In web design design area, prototypes allows for actual interaction with the end user be it as simple as seeing how certain UI elements will look or perform (e.g. button states, page configurations, navigation, etc) Prototypes could deliver a feeling more on “feel” – they may have visual design applied.  Prototype and sketches or a mock up which more applied in product design which allowing designers themselves to feel out how the end- product  comes to life.