<human>:  What is the difference between a merlot and a cabernet sauvignon?
<bot>: Merlot is a red wine grape, and cabernet sauvignon is a red wine grape. Merlot is grown in a wide variety of regions throughout the world, and is often blended with other grapes. Cabernet sauvignon is a red wine grape that is native to Bordeaux, France. It is the primary grape in the famous Cabernet Sauvignon wines.