All varieties of grapes are really berries and are native to Asia Minor where they were cultivated for 6000 years. Grapes are presently grown on six continents. The growing of grapes is known as viticulture. California produces 97% and Arizona 3% of all the European varieties grown in the USA.
Grapes should be plump and firm and attached to a green stem. They should have good color and never be faded. Grapes will not ripen off the vine so be sure they are ripe and sweet when you purchase them.
It is always best to taste your grapes before you buy them. Grapes will only stay fresh for 5-7 days even when refrigerated.
Raisins are made out of grapes. Raisins will not stick to food choppers if you soak them in cold water for 10 minutes before you chop them.
And yes Grapes along with the wine made from them are the biggest industry in the world.