Why is rhyme used?

in a poem, if you use rhyme it just makes it sound that bit better. even though poems can sound good without rhyme. if you use rhyme in a poem you can emphasis the rhyming Words which makes it sound good.

e.g

1. the snow fell down, 2. the snow fell down,

down to the ground down to the floor

example 1 sounds better than example 2. you can emphasis the last Word of the line and juts gives it a dramatic effect.