Positive reinforcement is a behavorial management technique in which something is added to a situation in order to increase the chances of the desired behavior happening, at all or in greater frequency.

Parents, teachers, clergy, supervisors, psychologists, (anyone else in a position of authority you can think of), use positive reinforcement to get their minions to do their bidding. The most common form of positive reinforcement is to add praise and/or tangible rewards to the situation. This may account for many a psych 101 student failing the portion of the test about positive reinforcement. Many people mistake 'positive' for 'good and yummy' instead of 'adding to'. If they misunderstand the concept of positive reinforcement, they probably also misunderstand the concept of negative reinforcement.