Chocolate is described as a ground cocoa beans mixed with sugar and vanilla.
Dark chocolate is a chocolate that contains more than 50% cocoa content. Besides chocolate liquor, it often contains added cocoa butter, sugar, vanilla, and often lecithin.
Milk chocolate is a chocolate liquor to which dairy, sugar, vanilla and often lecithin have been added. Quality milk chocolate should contain a minimum of 30% chocolate liquor.
White chocolate:is made from cocoa butter, dairy, sugar and vanilla (and often lecithin). It does not contain chocolate liquor, but must contain at least 33% cocao butter to be considered of good quality.