The development of laptops is continuing, with various upgrades and additional functions added, including variouspointing devices and disk drives, colour screens and touch screens;all while the devices tended to get smaller and lighter. Notebook or netbook computers are small laptops with screens of about 10 inches (25cm) or less, but no disk drives. Despite these advances, after 2010, people bought fewer laptops because of the popularity of tablet computers, which are even more portable.