First of all, cellophane noodles are easily confused with mi fen (rice vermicelli), which are made from rice. They both have something in common though - they are generally sold in dried form, boiled to reconstitute, then used in soups or stir fried dishes.
Cellophane noodles, also known as crystal noodles or glass noodles, are a type of transparent noodle made from starch (such as mung bean starch, yam, potato starch) and water. They are called "cellophane noodles" because of their appearance when cooked, resembling cellophane. ;)
Having lunch with my daughter. Yesterday.