Kir is the name of a popular French cocktail. It is very simple to make and has only two ingredients. To make it you need white wine and blackcurrant liqueur known as creme de cassis.
Here is the recipe:
Put two tablespoons of cassis in a wine glass. Add a 3/4 cup of dry white wine and stir.
Traditionally it is made with a white wine from the Burgundy regjon of France, but other wines are also used. If champagne is added instead of white wine, it's called a kir royal.