Vertical & Horizontal Wine Tastings

In a vertical wine tasting, different vintages (years) of the same wine type from the same winery are tasted.  This emphasizes the differences between various vintages.

In a horizontal wine tasting, the wines are all from the same vintage (year) but are from different wineries.  When doing a horizontal tasting, keeping the same wine type and wine region will help to emphasize the differences in winery and vintner styles.