Limericks are a form of humorous poetry consisting of five lines with a specific rhyme scheme (AABBA) and a distinct rhythm. They often feature witty or absurd themes, making them popular in English literature and folk traditions. Limericks can be found in various literary works, poetry collections, and online platforms dedicated to poetry and humor. They are also commonly used in light-hearted contexts, such as greetings cards and children's literature.