Cabernet sauvignon grapes are high in tannin and are often blended with lower tannin grapes, particularly Merlot, Cabernet Franc, and Shiraz / Syrah. As a group Cabernet Sauvignon wines are generally full-flavoured, with a stronger flavour than Merlot for instance, with a smooth "finish" that lacks the "peppery" bite of Shiraz / Syrah. One of the most characteristic aromas is cassis. There is, however, a great deal of variation in flavor depending on the region, winemaking technique, seasonal weather, and bottle age.
Cabernet Sauvignon is species Vitis Vinifera, and recent genetic testing indicates that it is the result of a cross between Cabernet Franc and Sauvignon Blanc.