Zinfandel is a dark-skinned grape variety widely grown in the United States, primarily in California. It is known for its high tannin and acidity, making it a big and bold red wine. In the 1990s, DNA research confirmed that Zinfandel is identical to Italy's Primitivo. The origin of the variety is still debated, with some believing it arrived in the US from Italy, while others believe it arrived via Croatia where it was known as Tribidrag and Crljenak Kastelanski. Zinfandel has been used to make various wine styles, including dry and sweet red wines, and the famous White Zinfandel blush. The variety is also grown in South Africa and Australia, but it hasn't acquired any particular significance in either of these countries.