A crash course is a short, intensive program designed to provide students with a comprehensive overview of a particular subject or skill in a relatively short amount of time. It typically involves intense study and practice sessions, often with the goal of preparing someone for an upcoming exam, presentation, or other important event. The phrase "crash course" is derived from the idea that the material is being taught at a fast pace, similar to how one might learn something quickly in order to avoid a collision (or crash).