A cywydd is a traditional Welsh poetic form that consists of a specific structure of rhymes and syllables. It typically features a series of couplets, where each line has a consistent number of syllables, often 10 or 12. The form is known for its musical quality and is often used to express themes of love, nature, and Welsh identity. The cywydd has its roots in medieval Welsh literature and was popularized by poets such as Dafydd ap Gwilym. This form is characterized by its intricate rhyme schemes and the use of alliteration, making it a unique and celebrated aspect of Welsh poetry.