Unconditioned Stimulus:An unconditioned stimulus is a stimulus that naturally and automatically triggers a response in an organism, without any prior learning or conditioning.
Conditioned Stimulus:A conditioned stimulus is a previously neutral stimulus that, through association with an unconditioned stimulus, has acquired the ability to elicit a response similar to the one produced by the unconditioned stimulus.
Classical Conditioning:Classical conditioning is a type of learning where an organism learns to associate two stimuli, leading to the production of a behavior in response to a stimulus that did not originally elicit that behavior.