Wool primarily comes from sheep, especially Merino sheep, which produce the finest quality wool. Sheep grow wool as a natural fiber covering their bodies, which acts as insulation to keep them warm in winter and cool in summer. The wool fiber is harvested through shearing, usually once a year, to maintain the welfare of the sheep. Australia is the largest wool producer globally, producing about a quarter of the world's wool, followed by countries like China, New Zealand, and Argentina. Merino wool, sourced from Merino sheep, is particularly valued for its fineness and softness, often used in high-end apparel. Besides sheep, wool can also come from other animals like goats and rabbits, but sheep wool is the most common and widely used.