Assonance:Repetition of a vowel sound within two or more words in close proximity.



Example: 
Some say the world will end in fire,
Some say in ice.From what I’ve tasted of desire
I hold with those who favor fire.
But if it had to perish twice,
I think I know enough of hate
To say that for destruction ice
Is also great and would suffice.
-Robert Frost

Explanation:
Robert Frost uses assonance in many of his poems. His purpose in this poem is to create a smooth and soothing transition between line to line. The poem does not have a perfect rhyme scheme, so the assonance adds flexibility and allows the poem to have a nice tone and flow, and not just be dull and boring. Also the assonance adds a spin on the poem and makes the reader have fun and be entertained while reading.