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Packed with powerful hardware in a compact size that is perfect for use on the go, a laptop has practically replaced the desktop as the form factor of choice among computer users. Since the development of the personal computer in the 1970s, technological innovation has been on the side of consumers. Computer components have become smaller, faster and less expensive over the preceding decades. Harnessing the power of robust operating systems like Microsoft Windows 8 and Apple OS X, many laptops are able to run the same suite of software prog that larger desktop machines use. Along with the release of the mobile phone and tablet form factors, a huge leap has occurred in display technology, user interface design and user experience that consumers around the world have enjoyed. The laptop comes in many different forms and sizes that suit a wide variety of users and preferences. For example, a desktop replacement laptop may have a screen size of 17 inches and be heavier than other mid-size models. On the other end of the spectrum are ultrabooks, which are usually less than one-inch thick and contain lightweight solid-state drives. The wide variety of choices means that there is a portable personal computer available for any type of user from the creative artisan to the studious collegian to the traveling road warrior professional. Rugged models that are built to withstand difficult weather and shocks to the frame are also available for construction and other outdoor professionals for use in the field. The Dell laptop and HP laptop models have been leading brands in the category over the past decade.