Energy drinks are different from conventional soft drinks due to their unique composition and function. Energy drinks are non-alcoholic beverages that contain functional ingredients, which have a beneficial effect on the human body. Energy drinks usually contain caffeine and a number of added water-soluble vitamins, most often a selection of B-group vitamins. Energy drinks also include taurine and other ingredients with a nutritional or physiological function. Flavourings, colourings and other additives that are also permitted in soft drinks are sometimes added to energy drinks for taste. Conventional soft drinks are non-alcoholic flavoured beverages consumed by the general population (including children) mainly for their refreshing taste. They are offered in a variety of flavours. Traditional soft drinks are mixtures of water with flavourings and are usually carbonated to give them a refreshing feel. Soft drinks can be sweetened with sugar or non-nutritive sweeteners. This category includes cola-type beverages which contain caffeine as a flavouring substance in smaller amounts when compared to energy drinks. Generally, they do not contain other functional ingredients.