A couplet is a pair of lines in poetry that usually rhyme and have the same meter. This structure creates a sense of rhythm and can emphasize a particular idea or theme. Couplet forms are often found in various types of poetry, including sonnets and nursery rhymes, making them accessible to readers of all ages. Couplets can convey complete thoughts or ideas, making them effective for storytelling or expressing emotions. Famous poets like William Shakespeare and Alexander Pope frequently used couplets in their works, showcasing their versatility and appeal in the literary world.