Unlike many coffee house drinks that are loaded with sugar or calories from pumps of sweet syrups, coffee soda is just coffee and sparkling soda or water. It has no calories. It delivers a hit of caffeine and some hydrating water over ice. You sweeten it with whatever you love. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.