"V" in wine glossary
In a vertical tasting, different vintages of the same wine type from the same winery are tasted. This emphasizes differences between various vintages. In a horizontal tasting, the wines are all from the same vintage but are from different wineries. Keeping wine variety or type and wine region the same helps emphasize differences in winery styles.
The year in which a particular wine's grapes were harvested. When a vintage year is indicated on a label, it signifies that all the grapes used to make the wine in the bottle were harvested in that year.