"Jack 'n Jill" is a traditional nursery rhyme that tells the story of two characters, Jack and Jill, who go up a hill to fetch a pail of water. The rhyme describes how Jack falls down and breaks his crown, while Jill comes tumbling after. This simple tale is often recited to children and is popular in many English-speaking countries. The rhyme is often used in early childhood education to help children develop language skills and rhythm. It has inspired various adaptations, illustrations, and even songs, making it a staple in children's literature and culture.