Learning involves a permanent change in behavior resulting from experience. There are many types of learning including motor, verbal, concept, and discrimination learning. Learning is influenced by factors related to the learner, teacher, and content. Several theories aim to explain the process of learning, including Thorndike's law of effect, Pavlov's classical conditioning, and Skinner's operant conditioning. Thorndike's theory proposes that behaviors followed by satisfaction become strengthened over time through rewards. Pavlov's theory demonstrates that a learned reflex can be developed by associating a stimulus with a response. Skinner's theory shows that behaviors can be shaped by reinforcing consequences.