A villanelle is a highly structured poetic form known for its lyrical beauty and intricate repetition. Originating from French verse, it consists of 19 lines arranged in five tercets (three-line stanzas) followed by a quatrain (four-line stanza). The form features two refrains: the first and third lines of the opening tercet, which alternate as the final line of each subsequent stanza and unite in the closing quatrain. Villanelles follow an ABA rhyme scheme, emphasizing musicality and emotional resonance.