Suppose your alarm made a slight clicking sound just before the alarm goes off. Even though you didn't wake up to the clicking sound initially, now you do, due to classical conditioning. In this example, the conditioned stimulus is

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The clicking sound is the conditioned stimulus because it is the stimulus that was originally neutral (not causing a response) but became associated with waking up to the alarm through classical conditioning.

Suppose Your Alarm Made a Slight Clicking Sound Just Before