Computer-aided 3d visualization is now the standard way for architects and designers to convey design ideas. Rendering techniques are yielding increasingly exciting and realistic images, 3d modeling programs are getting better at allowing designers to quickly generate - and quickly render - a variety of options.
In spite of these advances, we still find ourselves needing to quickly convey design ideas through sketch. Sometimes a computer or IPad is not readily available. Perhaps we are in a car, on an airplane, or even in a meeting where it would be inappropriate to have a computer or other form of distraction out. Sometimes, we may have technology available, but still prefer the freedom of not using a computer program that demands a certain degree of accuracy and detail. In these cases, we may choose to "draw" on our devices - thus using a stylus or our fingers in the same way we would use a pen or pencil. In all of these scenarios, we, as architects and designers, require traditional sketching skills in addition to the computer skills we likely already possess. In these scenarios, we find the best way to convey our thoughts and ideas is through sketch.
If you are looking to brush up on your sketching skills, take a look at the youtube video below, part of a video series called "Architecture Daily Sketches" from youtube user Themodmin. The series offers a range and variety of tips and tricks to bring your architectural drawings and sketching to the next level. Even if you don't need the advice, it is a fun series to watch, celebrating a fundamental skill. Enjoy.