Rhythm refers to the pattern of sounds and silences in speech or writing, creating a flow that engages the reader or listener. It plays a vital role in poetry and prose, as it can evoke emotions, emphasize ideas, and create musicality through the arrangement of words. Rhythm is closely linked to techniques like alliteration, assonance, and consonance, which enhance the musical quality of language, and also complements the structure of free verse, allowing for a more organic expression of thought.