Malt Whiskey, which is only made from barley malt. Single malt is made exclusively from barley malt and only in one distillery unlike blend whiskey. Scotch means whiskey is distilled and aged in Scotland and is a trademark all over the world. Irish is whiskey, distilled and aged in Ireland. The main difference between Scotch and Irish is that in Scotland they distill the drink twice and on Green Island three times.