Porter is a style of beer that was developed in London in the early 18th century. It is well-hopped and dark in appearance, owing to the use of brown malt. The name is believed to have originated from its popularity with porters. Porter became the first beer style brewed around the world, being produced in Great Britain, the Baltic states, Finland, Ireland, North America, Poland, Sweden, and Imperial Russia by the end of the 18th century.