Sketching is a very important tool for a designer. Not only is it possible to make visual records of existing designs, but it is also useful to work out new design ideas. A sort of visual brainstorming, to consider first thoughts in greater depth and refine initial ideas.
Sketching is a powerful process to use because it always helps discover the best ideas and solutions to a design problem. It is a difficult task to ‘freestyle’ a complex design out of midair without hashing out the details. This is why sketching will remain an important step in the design and development process.