What's Tapioca made of?

Tapioca is a flavorless, colorless, odorless starch extracted from the root of the plant species Manihot esculenta. This species, native to South America, is now cultivated worldwide and has many names, including cassava, bitter-cassava, manioc, "mandioca", "aipim", "macaxeira", "manioca", "boba", "yuca" (not to be confused with yucca) and "kappa" in the state of Kerala in India. Tapioca is a staple food in some regions and is used worldwide as a thickening agent, principally in foods. Tapioca is gluten free, and nearly protein free. The commercial form of tapioca most familiar to many people is pearl tapioca.  more