Absinthe is a very strong (80 to 150 proof) anise flavored spirit that is usually pale green in color. The real thing is derived from herbs that include Artemisia absinthium, or wormwood. This kind of Absinthe used to be banned in the United States due to its alleged hallucinogenic properties.
Instead, wormwood-free brands of Absinthe were all you could find for decades in the U.S. Thankfully the ban was lifted in 2007.
Absinthe is traditionally drunk in a drip cocktail which dilutes absinthe with cold water and optionally sugar. There are a great many cocktails that use absinthe in small amounts as a minor flavoring agent.
How do you drink your absinthe? Please chime in below in the comments.