"Hey Diddle Diddle" is a traditional nursery rhyme that features a whimsical story. It describes a cat playing a fiddle, a cow jumping over the moon, and a little dog laughing. The rhyme is known for its playful imagery and rhythmic structure, making it popular among children. The origins of "Hey Diddle Diddle" date back to the 16th century, and it has been passed down through generations. It is often used to introduce young children to the joys of poetry and storytelling, encouraging imagination and creativity through its silly characters and actions.