Gelatin is a processed form of protein made from the connective tissues, bones, and organs of animals (typically cows). It is colorless and tasteless, but forms a semi-solid gel. As such, it is used to thicken a great many products, such as foods like yogurt,candy, marshmallows, and many, many more, as well as in cosmetics, and as the coating of medicines-- anything where a thicker, more gel-like consistency is useful!