"Mary Had a Little Lamb" is a popular nursery rhyme that tells the story of a girl named Mary and her pet lamb. The lamb follows her to school, which causes a stir among the other children. The rhyme highlights the bond between Mary and her lamb, showcasing themes of friendship and loyalty. The origins of the rhyme date back to the 19th century, with various versions appearing over time. It is often used to teach children about rhythm and rhyme in poetry. The simple melody and repetitive structure make it a favorite for early childhood education and sing-alongs.