A spritzer is an alcoholic beverage made from white wine and carbonated water, or other soda such as lemon-lime. Like the shandy it is touted as a refreshing drink with a reduced alcoholic content, which may help people curb alcoholic excesses.
There are also non-alcoholic juice spritzers: fruit juices mixed with sodas.
The word spritzer comes from the German spritzen, "spray" or "sprinkle", however mixed wine and soda drinks in Germany are termed Schorlen (i.e. a white wine and apple juice spritzer is called Apfelschorle).