Angora yarn is made from the downy coat of the angora rabbit. It is different from the mohair produced from angora goats.
Angora rabbits moult about every four months. The fur they shed is then collected and used to make yarn. This is a labour intensive process that makes angora quite expensive.
Angora is a luxury fiber in the same class as mohair, alpaca, and merino.

* Image used with permission.