An ultraportable IBM X31 with 12" screen on an IBM T43 Thin & Light laptop with a 14" screen A laptop computer, also known as a notebook computer, is a small personal computer designed for mobile use. A laptop integrates all of the typical components of a desktop computer, including a display, a keyboard, a pointing device (a touchpad, also known as a trackpad, or a pointing stick) and a battery into a single portable unit. The rechargeable battery is charged from an AC/DC adapter and has enough capacity to power the laptop for several hours, enabling it to be used virtually anywhere. A laptop is usually shaped like a large notebook with thickness of 0.7-1.5 inches (1.7-4cm) and dimensions ranging from 10x8 inches (27x22cm, 13" display) to 15x11 inches (39x28cm, 17" display) and up. Modern laptops weigh 3 to 12 pounds (1.4 to 5.4 kg), and some older laptops were even heavier. Most laptops are designed in the flip form factor to protect the screen and the keyboard when closed. Originally aimed at professionals "on the go", early laptops were expensive, limited in capabilities and heavy. They were relatively incommon, with desktops occupying most of the personal computer market: in 1996, just 17% of personal computers sold worldwide were laptops [1]. However, as the advance of technology made notebook computers more capable, as prices fell from several thousand dollars to several hundreds for basic models, and as more and more people found themselves using computers daily, the compactness and the portability of laptops made them the personal computers of choice for many consumers. It is now expected that more laptops than desktops will be sold as soon as 2009[2][3].