Classical conditioning is a type of learning where two events are paired together to create a learned response. It is as complex as operant conditioning. The goal is to understand how behaviors are learned. In classical conditioning, a neutral stimulus (like a bell) is paired with a natural stimulus (like food), leading to a learned response (like salivating at the sound of the bell). This type of learning is often used to study how drugs affect learning. Classical conditioning is useful for studying learning because it has advantages over other types of learning studies.