Final answer:
Assonance is the repetition of vowel sounds while consonance is the repetition of consonant sounds in a piece of writing, both adding rhythm and musicality to the text.
Step-by-step explanation:
Assonance and consonance are poetic devices used to add rhythm and musicality to a piece of writing. Assonance is the repetition of vowel sounds within close proximity, which can create an internal rhyme or add to the mood of the poem. For instance, consider the line 'The water-side. We fancied that the sea had floated the seeds ashore', where the repetition of the 'ea' sound in 'fancied', 'sea', and 'floated' is an example of assonance. Consonance, on the other hand, refers to the repetition of consonant sounds. A great example is seen in the text, 'the fireplace, of the fluttering of swallows in the chimney', as the 'fl' sound in 'fluttering' and 'swallows' and the 'ch' sound in 'chimney' exemplify consonance.