Calvados is a well-known apple brandy. It is made in Normandy, a region in the northwest of France. There are over 50 varieties of apple used to make Calvados, most of which are small and bitter, yet when crushed, fermented into cider, and double-distilled into pot stills, make the best brandy. Other Calvados is simply distilled once.
After distillation, all Calvados is aged in oak casks, sometimes for several decades. (Calvados matures more slowly than other brandies since the proof is not reduced prior to barreling.)