This document summarizes classical conditioning, which is a form of learning in which a neutral stimulus becomes associated with an unconditioned stimulus to produce a conditioned response. It provides examples of classical conditioning, such as Pavlov's experiment where a dog learned to associate the ringing of a bell with food. The key terms of classical conditioning are defined, including unconditioned stimulus, neutral stimulus, conditioned stimulus, unconditioned response, and conditioned response. Extinction of conditioned responses and spontaneous recovery are also described.