Crude oil can be divided into light crude oil and heavy crude oil based on API gravity, and can also be divided into sulfur-containing crude oil and sweet crude oil based on sulfur content. Brent crude oil (XBRUSD) is a light, sweet crude oil produced from several oil regions in the North Atlantic. West Texas Intermediate (XTIUSD), which is relatively lighter and has lower sulfur content, is often quoted at a discount to Brent.