Cynghanedd is a traditional Welsh poetic form that emphasizes sound patterns and harmony. It involves the use of alliteration, internal rhyme, and specific syllable counts to create a musical quality in the verse. This technique is often employed in Welsh literature and is a hallmark of cywydd and other forms of Welsh poetry. There are several types of cynghanedd, including cynghanedd lusg and cynghanedd groes, each with its own rules regarding sound and structure. Poets use these forms to enhance the emotional impact of their work, making cynghanedd a vital aspect of Welsh cultural heritage and identity.