Learning theory is called "learning theory" for short. Theories that explain the nature, process and influencing factors of human and animal learning. Psychologists have put forward many learning theories from different angles, using different methods and according to different experimental data. Generally, it is divided into two theoretical systems: stimulus-response (S-R) theory and cognitive theory. Stimulation-response theory, also known as associationism (or behaviorism), is a theoretical system that inherits the British associative psychology school and is influenced by Locke's empiricism in philosophy. This school of theory generally regards learning as the establishment of the connection between stimulus and response or the formation of habits, and thinks that learning is a spontaneous process of "trial and error" (trial and error for short).