Both Port wine and Sherry are variants of fortified wine.  Port wine is a type of dessert wine mainly made in the Douro Valley of Portugal. "Sherry," on the other hand, is an aged white wine that was first produced in the Jerez region of Spain.  The main difference is that port wine is a sweet fortified wine, while sherry can be sweet or dry. There are several variants of port wine, including tawny, ruby, and vintage. Sherry also has multiple variants, including cream sherry and manzanilla. The Port wine is aged in second-use oak barrels for about two years. A vintage port will have been aged at least three years, with some wines continuing to age and improve for up to 50 or 60 years. The Sherry wine is aged in oak casks for three to six years, but some sherries are aged much longer before being sold.