Neat – Most whiskey connoisseurs will recommend at least taking your first sip neat, meaning served alone, unmixed and not chilled.
On the rocks – Since whiskey is a potent, high alcohol content liquor, many prefer to dilute it a bit to lower the alcohol by volume (ABV). Those drinkers order on the rocks, meaning over ice.
Experts recommend enjoying whiskey at room temperature as cooling it numbs the flavors slightly. To avoid taking too much of the edge off, try whiskey stones to get to the preferred drinking temperature without diluting.https://www.invaluable.com/blog/types-of-whiskey/?curatedcampaign=giftguide2018