Fashion illustration is the art of communicating fashion ideas in a visual form through the use of drawing tools or design-based software programs. It is mainly used by fashion designers to brainstorm their ideas on paper or digitally. Fashion illustration plays a major role in design - it enables designers to preview garment ideas before they are converted to patterns and physically manufactured.

An illustration is a decoration, interpretation, or visual explanation of a text, concept, or process, designed for integration in print and digitally published media, such as posters, flyers, magazines, books, teaching materials, animations, video games and films. An illustration is typically created by an illustrator. Digital illustrations are often used to make websites and apps more user-friendly, such as the use of emojis to accompany digital type. Illustration also means providing an example; either in writing or in picture form.