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Reinforcement in Applied Behavior Analysis (ABA) is fundamentally aimed at increasing the likelihood of a desired behavior occurring in the future. When a specific behavior is followed by a reinforcing stimulus, it strengthens the association between the behavior and that stimulus, making it more probable that the behavior will be repeated. This principle is based on the understanding that behaviors that are positively reinforced tend to be repeated, while those that are not may diminish over time.

In context, while decreasing undesirable behaviors and ensuring compliance with rules are important aspects of behavior management, they do not capture the essence of what reinforcement seeks to achieve. Punishment, on the other hand, is a separate concept focused on decreasing the frequency of inappropriate actions, which contrasts with the goal of reinforcement.

Therefore, the primary purpose of reinforcement is to encourage and increase specific, desired behaviors through positive or negative consequences that follow those behaviors. This principle is critical in developing effective intervention strategies within ABA to promote adaptive and functional behaviors.