Amazon Kindle is a machine for reading electronic books (e-books). The Kindle is designed by Lab126, a part of the Amazon.com company. The first Kindles were sold in the United States on November 19, 2007. Six hardware devices, known as "Kindle", "Kindle 2", "Kindle 3", "Kindle 4", "Kindle Touch", and "Kindle Fire" support this platform. There are also software versions of Kindle than can be used on smartphones and computers.