A small 300ml bottle of Coke has about 120 calories. A 500ml bottle of normal Coke has about 200 calories. Sugar-free Coke has almost no calories, close to 0 kcal, because it contains added sweeteners and no sugar.
Cola refers to a sweet, caffeinated but non-alcoholic carbonated drink. Flavors include vanilla, cinnamon, lemon, etc. The name comes from one of the early ingredients of cola: kola nut extract. The most well-known cola brands are Coca-Cola and Pepsi-Cola.
The main recipe for Coke is public. To commemorate Coca-Cola's 100th birthday in 1986, Gustein named the new formula "7×100." The ingredients are sugar, carbonated water (carbon dioxide and water), caramel, phosphoric acid, caffeine, etc. It is this mixture of spices that gives Coke its unique taste.