Dewar's The Vintage 18 Year Old Scotch is a blend of whiskies aged at least 18 years, which then undergo a secondary aging in oak to better marry the flavors together. It is one of Dewar's' most critically-acclaimed products.
Dewar's was founded by John Dewar, Sr. in 1846, later taken over by his sons, and eventually worked its through the corporate maze to become part of Bacardi. The brand was popularized in two fairly unconventional ways: Tommy Dewar, one of John's sons, was a successful travel journalist who used his platform to promote the family business, and Andrew Carnegie sort-of-famously sent a cask of Dewar's to the White House to celebrate Benjamin Harrison's inauguration in 1889. It has since become one of the best-selling blended scotch whiskies in the world.