Understanding Classical Conditioning through Pavlov's Experiment

In psychology, the concept of classical conditioning refers to a learning process in which a previously neutral stimulus becomes associated with a meaningful stimulus and acquires the ability to elicit a similar response. One well-known example of classical conditioning is the experiment conducted by Ivan Pavlov with dogs, where he paired the sound of a bell with the presentation of food, leading the dogs to salivate at the sound of the bell alone after several pairings.

Using the terms 'unconditioned stimulus,' 'conditioned stimulus,' and 'conditioned response,' explain how Pavlov's experiment demonstrates the principle of classical conditioning.