Sellotape is a British brand of transparent, cellulose-based, pressure-sensitive adhesive tape, and it stands as the leading brand in the United Kingdom. Originally launched in 1937, the name "Sellotape" was cleverly derived from "Cellophane," a trademarked name at the time. Over the decades, Sellotape has become so ubiquitous in Britain and several other countries that its name has become a genericized trademark, much like "Scotch Tape" in North America, often used to refer to any brand of clear adhesive tape.