Fortified wines are typically classified into four different styles:

1. Port wine - a sweet, red wine that is fortified with brandy. It is produced in the Douro Valley of Portugal and comes in several varieties, including tawny, ruby, and vintage.

2. Sherry - a fortified wine from the Andalusia region of Spain. Sherries can be dry or sweet and come in several different varieties, including fino, manzanilla, amontillado, and oloroso.

3. Madeira - a fortified wine from the Portuguese island of Madeira. It can be sweet or dry and comes in several different varieties, including Sercial, Verdelho, Bual, and Malmsey.

4. Marsala - a fortified wine from the Sicilian city of Marsala. It can be sweet or dry and comes in several different varieties, including oro, ambra, and rubino.

Each style of fortified wine has its own unique characteristics and flavor profile. For example, Port wine is typically sweet and full-bodied, with flavors of dark fruit, chocolate, and spice. Sherry, on the other hand, can be either dry or sweet and has a distinctive nutty flavor. Madeira is known for its complex flavors, which can include notes of caramel, nuts, and dried fruit. Marsala is typically sweet and has a rich, deep flavor that is often compared to caramel or toffee.

When tasting fortified wines, it is important to consider the style of the wine and its unique characteristics. Fortified wines are typically higher in alcohol content than regular wines, so it is important to sip them slowly and in moderation.

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