"Mary Had a Little Lamb" is a popular nursery rhyme that tells the story of a girl named Mary and her pet lamb. The rhyme describes how the lamb follows Mary everywhere she goes, highlighting the bond between them. It is often sung to a simple melody, making it easy for children to remember and enjoy. The origins of the rhyme date back to the 19th century, with the first known publication in 1830. It is commonly used in early childhood education to teach children about rhythm, rhyme, and the joy of storytelling. The song has become a classic in children's literature.