Port wine is a fortified wine that originates from the Douro Valley in Portugal. It is made by adding grape spirit, or aguardente, to the wine during fermentation, which stops the fermentation process and preserves the natural sugars. This results in a sweet, rich flavor profile, often with notes of dark fruits, chocolate, and spices. There are several styles of Port wine, including Ruby, Tawny, and Vintage. Each style varies in taste, aging process, and complexity. Ruby Port is known for its vibrant color and fruity flavor, while Tawny Port is aged longer in wooden casks, giving it a nutty, caramelized taste.