Splenda is a calorie free sugar substitute. Well, not quite... It is sugar, only they somehow manage to remove the carbohydrates so that it has no calories. This is by far the best sugar substitute on the market, it tastes pretty much like sugar, and unlike other substitutes, it can be used in baking. No nasty aftertaste either. It's a great way to make low calorie versions of your favorite desserts. It's been used for some time in sugar free products but only recently became available for consumer purchase. If you can't find it at your grocery store, you can order it online from their website at www.splenda.com.