Motivation in the workplace is often driven by a system of rewards, which are generally categorized into intrinsic and extrinsic types. Intrinsic rewards are internal to the individual and come from the work itself; examples include a sense of accomplishment, personal growth, or the satisfaction of completing a difficult task. These are self-granted rewards.

Extrinsic rewards, conversely, are tangible rewards given by another person (usually a manager or the organization) to an employee for performing a specific task or behavior. These include salary increases, bonuses, promotions, benefits, and even smaller tokens like a free lunch. In this scenario, the free lunch is a physical, external incentive provided by the manager to reinforce the employee's positive performance. While intrinsic rewards are essential for long-term engagement and 'meaningful' work, extrinsic rewards like a free meal are effective for immediate reinforcement and recognizing specific achievements. According to reinforcement theory, providing such a reward immediately following a desired behavior (doing well at work) increases the probability that the behavior will be repeated. Because the lunch is an external, tangible benefit provided by the manager rather than an internal feeling of satisfaction derived from the task itself, it is classified as an extrinsic reward.