An energy drink is a type of drink containing stimulant compounds, usually caffeine, which is marketed as providing mental and physical stimulation (marketed as "energy", but distinct from food energy). they may or may not be carbonated and may also contain sugar, other sweeteners, herbal extracts, taurine, and amino acids. they are a subset of the larger group of energy products, which includes bars and gels, and distinct from sports drinks, which are advertised to enhance sports performance. there are many brands and varieties in this drink category. coffee, tea and other naturally caffeinated drinks are usually not considered energy drinks. other soft drinks such as cola may contain ca...

Source: Wikipedia