This is what we found on Wikipedia regarding the Cola:

Cola is a carbonated soft drink flavored with vanilla, cinnamon, citrus oils, and other flavorings. Cola became popular worldwide after the American pharmacist John Stith Pemberton invented Coca-Cola, a trademarked brand, in 1886, which was imitated by other manufacturers. Most colas originally contained caffeine from the kola nut (Cola acuminata), leading to the drink's name, though other sources of caffeine are generally used in modern formulations. The Pemberton cola drink also contained a coca plant extract. His non-alcoholic recipe was inspired by the coca wine of pharmacist Angelo Mariani, created in 1863.

Most modern colas have a dark caramel color and are sweetened with sugar, high-fructose corn syrup or artificial sweeteners. They come in numerous different brands, with Coca-Cola and Pepsi being among the most popular. These two companies have been competing since the 1890s, a rivalry that has intensified since the 1980s.