A soft drink (see ยง Terminology for other names) is any water-based flavored drink, usually but not necessarily carbonated, and typically including added sweetener. Flavors used can be natural or artificial. The sweetener may be a sugar, high-fructose corn syrup, fruit juice, a sugar substitute (in the case of diet sodas), or some combination of these. Soft drinks may also contain caffeine, colorings, preservatives and other ingredients.