Classical conditioning is a learning process that associates a neutral stimulus with an unconditioned stimulus to elicit a conditioned response, while operant conditioning is a learning process that associates a behavior with its consequences, such as rewards or punishments.
Classical conditioning involves learning by association, where two stimuli are linked together to produce a new learned response in a person or animal. Operant conditioning, on the other hand, involves learning by consequences, where behaviors are strengthened or weakened by the consequences that follow them.