A laptop computer, or simply laptop (also notebook computer or notebook), is a small
mobile computer, which usually weighs 2-18 pounds (1-6 kilograms), depending on size, materials, and other factors.A laptop computer is much smaller than a desktop. Laptops usually run on a single main
battery or from an external
AC/DC adapter which can charge the battery while also supplying power to the computer itself. Many computers also have a 3 volt cell to run the clock and other processes in the event of a power failure.
See more at Wikipedia.org...