Prototyping is when designs are presented in a realistic manner that closely resembles the final implemented version of how it is supposed to look and function. Often times knowing how to prototype involves knowing what is possible behind the scenes to create certain interactions or transitions.

Prototyping for the web can be a powerful tool when presenting dashboards or visual-heavy websites that require complex animations or micro-interactions and gets exciting when one can visualize the end action, and it's intended purpose.