Lego A/S,[a] doing business as The Lego Group,[b] is a Danish family-owned company based in Billund, Denmark. It is best known for the manufacture of Lego-brand toys, consisting mostly of interlocking plastic bricks. The Lego Group has also built several amusement parks around the world, each known as "Legoland", and operates several retail stores. The company was founded on 10 August 1932 by Ole Kirk Christiansen. The word "lego" is derived from the Danish words "leg godt", meaning "play well". The word "lego" also means "I put together" in Latin, and "I connect" or "I tie" in Italian. In the first half of 2015, The Lego Group became the worlds largest toy company by revenue, with sales amounting to US$2.1 billion, surpassing Mattel, which had US$1.9 billion in sales. The history of Lego spans nearly 100 years, beginning with the creation of small wooden playthings during the early 20th century. Manufacturing of plastic Lego bricks began in Denmark in 1947, but since has grown to include factories throughout the world.