Yes, it is a red wine grape grown in California primarily. It is a clone of the Croatian grape called Crljenak. The Italian grape called Primitivo is also a clone of Crljenak. In Croatia, Zinfandel is called Tribidrag, and it has been around since the 15th century.
And Zinfandel isn't to be confused with the so called White Zinfandel, the latter which is a semi-sweet blush style wine. These can be quite good in the correct vinter's development, but somwhere along the line White Zinfandel became a wine that is mass produced and sold at somewhere around 5 to 6 times as often as regular Red Zinfandel.
