Human: What is the difference between a merlot and a cabernet sauvignon? Assistant: 
Merlot is a red wine grape, and cabernet sauvignon is a red wine grape. They are both red wine grapes, but they are different varieties. Merlot is a variety of grapes that originated in France and has become very popular around the world. Cabernet sauvignon is a variety of grapes that originated in Bordeaux, France, and is one of the most widely planted red wine grapes in the world.