A nursery rhyme is a type of poem or song that has been popular for centuries, particularly among young children. These rhymes often have simple lyrics and catchy melodies, making them easy to memorize and enjoyable for kids to sing along with. They are typically associated with early childhood education and are used as tools to help develop language skills, memory retention, and cognitive abilities in young children. Some well-known examples of nursery rhymes include "Mary Had a Little Lamb," "Humpty Dumpty," and "Twinkle Twinkle Little Star."