Answer:Sound devices are literary techniques that use the repetition of specific sounds to create a particular effect in writing, often to enhance the rhythm, imagery, or mood of a piece. Here are the definitions of the four main sound devices: Alliteration:The repetition of the same initial consonant sounds in a series of words. Example: "Peter Piper picked a peck of pickled peppers". Assonance:The repetition of the same vowel sounds within words, regardless of their position. Example: "The mellow bells of the evening". Consonance:The repetition of consonant sounds within or at the end of words, not necessarily at the beginning. Example: "He struck a streak of bad luck". Onomatopoeia:Words that imitate the sounds they describe. Example: "The cat meowed" or "The clock ticked".