Cucumbers are oblong shaped fruits with green skin. They are members of the gourd family, which includes various types of melons and squash. Cucumbers have a firm outer skin, and are very moist when sliced open. This is because cucumbers are made up of roughly 96% water. They have a mild and slightly sweet flavor that provides a nice cooling effect when juiced. The three major varieties of cucumber include pickling, slicing, and burpless. The world's top producers of cucumber today include China, Turkey, Russia, Iran, and the U.S.