What is the difference between drawing and sketching?
Drawing is a form of visual art that makes use of any number of drawing instruments to mark a two-dimensional medium. Instruments used include graphite pencils, pen and ink, inked brushes, wax color pencils, crayons, charcoal, chalk, pastels, various kinds of erasers, markers, styluses, and various metals (such as silverpoint). An artist who practices or works in drawing may be called a draftsman or draughtsman.
Sketching is generally a prescribed part of the studies of painting and sculpture students. This generally includes making sketches (croquis) from a live model whose pose changes every few minutes. A “sketch” usually implies a quick and loosely drawn work, while related terms such as study, modello and “preparatory drawing” usually refer to more finished and careful works to be used as a basis for a final work, often in a different medium, but the distinction is imprecise.
Both above from Wikipedia