Learning involves acquiring knowledge or skills through experience, practice, or being taught, which brings about relatively permanent changes in behavior. Major theories of learning include classical conditioning by Ivan Pavlov, in which a stimulus becomes associated with a response; operant conditioning by B.F. Skinner, in which behaviors are reinforced or punished; and social learning theory by Albert Bandura, which emphasizes that people can learn through observation of others. Learning theories provide frameworks for understanding how experiences shape behavior.