Final answer:
Classical conditioning involves involuntary responses, while operant conditioning involves voluntary behaviors.
Step-by-step explanation:
Classical conditioning involves the association of an involuntary response with a stimulus, while operant conditioning involves the association of a voluntary behavior with its consequences. In classical conditioning, an animal learns to associate a reflexive response to a neutral stimulus, while in operant conditioning, an animal learns to associate a voluntary behavior with a consequence. For example, in classical conditioning, a dog might learn to salivate at the sound of a bell, while in operant conditioning, a dog might learn to sit in response to the command 'sit' because it knows it will be rewarded.