Both terms refer to a type of wool. Sheep's wool is usually called simply "wool", since it is the most traditionally used and also today it is the most widespread wool and, let's say, "easy" to obtain.
For its part, cashmere is a goat's wool. There are many breeds of goat from which cashmere can be extracted and these are called Kashmiri goats.
As for the differences between the two wools, true cashmere wool is warmer, lighter and softer than sheep's wool. Likewise, cashmere is a wool that does not itch. Although 100% cashmere wools are hardly ever found on the market, a high percentage of cashmere results in a very soft and fluffy wool, which at the same time has a certain strong and beautiful look and feel.
