Energy Drinks is most often used for
Energy Drinks are a classification of drinks designed to provide acute neural benefits such as stimulation, focus, and anti-fatigue. Most energy drinks have caffeine as their primary ingredient.
'Energy Drinks' are fairly well studied as a combination of ingredients, and even more so as isolated ingredients. That being said, sometimes the combination of ingredients exerts different effects than isolated ingredients (when beneficial, it is known as 'synergism')
There are benefits associated with chronic caffeine consumption, and there are benefits associated with acute caffeine consumption that fade with tolerance; if you like the latter, cycling is mandatory. If you like the former, cycling is not needed.