What is the difference between assonance and sibilance?

Both assonance and sibilance are literary devices that involve the repetition of sounds. However, they differ in the type of sound that is repeated.

Assonance is the repetition of vowel sounds in a series of words (e.g., “sweet dreams”), while sibilance is the repetition of sibilant sounds or letters producing an “s” sound (e.g., “she sells seashells”).