What is the Difference Between Similar But Different Things, Terms, and Objects

What is the Difference between Plain, Dark, Cooking, Milk and White Chocolate

Chocolate is a famous food which is eaten around the world. It was cultivated hundreds of years back in different part of the world. Now a day we get it in raw as well as processed forms. People love different kinds of chocolates. We commonly hear words like plain chocolate, dark chocolate, cooking chocolate and milk chocolate.