Ideation Sketching is One of Means Which Are Suit for A Fuzzy Start
Draw quick and loose, Use sketch to understand a problem, analyze structure and elements relevant to the project.
Map out readable sketches. Generate and explore more to illustrate the more fleshed out ideas for evaluating.
Create to explain context, interaction and functionality, often communicate a design in a clear and neutral manner.
Goes further than explanatory ones, it was drawn to influence the audience, convey the character and sell a design.