Drink mixers are the non-alcoholic ingredients in mixed drinks and cocktails. Mixers dilute the drink, lowering the alcohol by volume. They change or enhance flavors or add new ones to a drink. They may make the drink sweeter, more sour, or more savory. Drink mixers may also be used strictly for decorative purposes by changing the color or appearance of the drink. They also simply increase the volume of a drink, to make it last longer.