Brent crude is oil from the North Sea. It is used as the price benchmark for oil in Europe, Africa and the Middle East.
According to the U.S. Energy Information Administration in 2011, Brent crude oil is "actually a combination of crude oil from 15 different oil fields in the Brent and Ninian systems located in the North Sea. Its API gravity is 38.3 degrees (making it a “light” crude oil, but not quite as “light” as WTI), while it contains about 0.37 percent of sulfur (making it a “sweet” crude oil, but again slightly less “sweet” than WTI). ... Brent blend is generally priced at about a $4 per-barrel premium to the OPEC Basket price or about a $1 to $2 per-barrel discount to WTI, although on a daily basis the pricing relationships can vary greatly."