Which type of wine typically has a higher alcohol content of 16-23%?

Fortified wines are wines to which a distilled spirit, typically brandy, has been added. This process increases the wine's alcohol content, usually ranging from 16% to 23%. Fortified wines, such as Port, Sherry, and Madeira, are made this way to enhance their flavor profile and preserve them for longer periods, as the higher alcohol content helps inhibit spoilage.

In contrast, red wines, white wines, and sparkling wines usually have a lower alcohol content, typically between 9% and 15%. While some robust red wines may reach the upper end of that range, they do not reach the levels associated with fortified wines. The addition of spirit to create fortified wines is what distinguishes them and enables that higher alcohol percentage.