Port is a fortified wine that is produced by adding grape spirit (aguardente) to fermenting grape juice, which stops fermentation and preserves natural sugars. This process results in a sweet, high-alcohol wine that is often enjoyed as a dessert wine or paired with cheese. The most well-known styles of port include Ruby, Tawny, and Vintage, each varying in flavor profile and aging process. Port's significance lies not only in its unique taste but also in its cultural heritage, particularly in Portuguese winemaking traditions.

Port wine has a long history, dating back to the 17th century when British merchants began exporting it from Portugal. Related terms include "fortified wine," which refers to any wine that has had spirits added to it. Common pitfalls include confusing port with other types of fortified wines, such as sherry or vermouth, which have different production methods and flavor profiles. The term "port" itself comes from the city of Porto in Portugal, where the wine was traditionally shipped.