Single Malt Scotch is a type of whisky, distilled by a single distillery in a pot still, using malted barley as the only grain ingredient in Scotland. As with any Scotch whisky, a Single Malt Scotch must be distilled in Scotland and matured in oak casks in Scotland for at least three years (most single malts are matured for longer).
All single malt Scotch goes through a similar batch production process. At bottling time various batches are mixed together or vatted to achieve consistent flavours from one bottling run to the next. Even so, some variation does occur.