ASUSTeK Computer Incorporated (Asus) ( ) is a Taiwan-based company that produces motherboards, graphics cards, optical drives, PDAs, notebook computers, servers, networking products, mobile phones, computer cases, computer components and computer cooling systems. Commonly called by its brand name Asus (pronounced blank">ah-soo-ss or [a'sus] in _IPA), it is listed on both the London Stock Exchange and the Taiwan Stock Exchange.