The feedback is instantaneous and meaningful, and the chance to match wits with your instructor can be exciting. Voluntary class participation is not a necessity, but it can be enjoyable. The more people who comment, the livelier class will be. If you should choose not to volunteer, always try to answer the professor's questions in your mind. If you can answer most of them, you are doing well.
Every professor expects preparedness each day of class.
Certain professors choose a different student each class to comment on the material and will grade class participation, thereby placing a special premium on individual distinction. Again, others note participation but will only use it if it influences a student's borderline grade. Most professors will tell you their policy, but if not, be certain to learn the expectations of each professor. Review your briefs and study notes before class. If you read the material several days before you are asked about it, you will be unprepared.