Silk comes from silkworms and wool comes from sheep, goat and yak.
Sheep hair is sheared off from the its body, scoured, sorted, dried, dyed, spun and woven to yield wool.
Silkworms are caterpillars of silk moth, during their life cycle, the worms spin cocoons of silk fibres. Silk fibres are separated out from the cocoon and reeled into silk threads. The silk threads can be weaved into silk cloth.