Wine is an alcoholic beverage made from the fermentation of fruit or vegetable juice. It is produced by fermenting the crushed fruits or vegetables, often grapes, using various types of yeast which consume the sugars and convert them into alcohol.
Light, dry (and usually inexpensive) red wine is added to the drink sangria.
A good way of ensuring that you always have red or white wine spare for cooking is to freeze any leftovers in small paper or plastic vending machine coffee cups. They can be defrosted in a microwave and used immediately.