Solera: A set of barrels, frequently stacked, each containing multiple vintages of wine or spirits. The solera process, by which a given year's wine production is drawn from the oldest barrels in the solera and a portion of each subsequent vintage is used to top off each older barrel, is common to Sherry, Madeira, brandies and some Ports and whiskies.
Sherry: Sherry is a fortified wine made in Jerez, Spain, most often from the Palomino grape but also from the Pedro Ximénez and Moscatel varieties. Following fermentation, the wine is fortified with distilled wine spirit, up to the minimum strength of 15.5 percent alcohol. The fortified wine is then usually aged in oak barrels arranged in a solera system of multiple vintages, and which may include more than a hundred vintages of Sherry blended together. Sherries may be classified by their quality, age, sweetness and or alcohol contents into categories which include fino, manzanilla, amontillado, oloroso, cream, etc.