From the Wikipedia article:
Commodore International (other names include Commodore International Limited, or most simply Commodore) was an American home computer and electronics manufacturer founded by Jack Tramiel. Commodore International (CI), along with its subsidiary Commodore Business Machines (CBM), participated in the development of the home-personal computer industry in the 1970s and 1980s. The company developed and marketed the world's best-selling desktop computer, the Commodore 64 (1982), and released its Amiga computer line in July 1985. With quarterly sales ending 1983 of $49 million, Commodore was one of the world's largest personal computer manufacturers.
Commodore was most famous for its Commodore 64 home computer. If you include its hardware revisions including the 64C (which was housed in a unique case), the 64 is most successful single model of home or personal computer in history, with sales somewhere around 17 million units.
Commodore went out of business in 1993. The Amiga division was bought initially by Escom (a company which itself dissolved trying to restore the Amiga), then by Gateway, then by Amino. The Commodore division, which included its line of 8-bit computers, was bought by Tulip.