Lenovo Group Ltd. is a multinational computer technology company with headquarters in  the United States. It designs, develops, manufactures and sells servers, electronic storage devices, personal computers, tablet computers, smartphones, workstations, IT management software and smart televisions. In 2015, Lenovo was the world’s largest personal computer vendor by unit sales. It markets the ThinkPad line of notebook computers, IdeaPad line of notebook laptops, IdeaCentre line of desktops, Yoga line of notebook laptops, and the ThinkCentre line of desktops.