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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. more...

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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.

As personal computers, laptops are capable of the same tasks as a desktop computer, although they are typically less powerful for the same price. They contain components that are similar to their desktop counterparts and perform the same functions, but are miniaturized and optimized for mobile use and efficient power consumption. Laptops usually have liquid crystal displays and most of them use different memory modules for their random access memory (RAM), for instance, SO-DIMM in lieu of the larger DIMMs. In addition to a built-in keyboard, they may utilize a touchpad (also known as a trackpad) or a pointing stick for input, though an external keyboard or mouse can usually be attached.

Categories

Terms sometimes used for subtypes of laptop computers include:

UMPCs

These Ultra-Mobile PCs are mobile computers with a size comparable to PDAs - they are extremely portable. Because of their small size, they incorporate a 20 cm (7 inch) or smaller touch-screen for the user to interact with it (as with a virtual keyboard), though some (such as the OQO Model 02) are designed with a miniature physical keyboard (a thumbboard) and mouse interface. They house lower performing, power-saving components (in comparison to larger laptops). Examples of UMPCs are the OQO Model 02 and the Sony VAIO UX Micro PC.

Ultraportables

Laptops with screens typically less than 12 (30cm) inches diagonally and a weight of less than 3-5 lbs (1.4 - 2.3 kgs). Their keyboards are usually not full-size. Their primary audience is usually business travelers, who need small, light laptops. Ultraportables are often very expensive, have extended battery life, house power-saving CPUs and almost always have integrated graphics. However Dell released the XPS M1210 and XPS M1330 which has 12.1 and 13.3 inch screens. Both system have dedicated graphic solution and they are under 2kg. The end result is ultraportability and a hefty price tag.

Thin-and-lights

Laptops usually weighing in between 4-6 lbs (1.8 - 2.7 kgs) with a screen size of between 12 and 14 inches (30 - 35cm) diagonally. Examples of this variety: the Sony VAIO CR , HP Pavilion DV2000 and Apple MacBook.

Mainstream

Laptops weighing in between 5 and 7 lbs (2.3 - 3.2 kgs),with a screen size of 14.1 inches (35cm) and 15.4 inches (39.1) .Examples:Dell Inspiron E1405, E1505,1420,1520/1521 and 1501, Acer Aspire 5520, 5920

Desktop replacement computers

Powerful laptops meant to be mainly used in a fixed location and infrequently carried out due to their weight and size; the latter provides more space for powerful components and a big screen, usually measuring 17-20 inches (43 - 51 cm). Desktop replacements tend to have limited battery life, rarely exceeding three hours, because the hardware is not optimized for efficient power usage. Sometimes called a luggable laptop. An example of a desktop replacement computers are gaming notebooks, which are designed to handle 3D graphic-intensive processing for gamers. These notebooks possess similar features as desktop computers.An example of this is the Dell Inspiron E1705,1720/1721, XPS 1710, 2010, Sony AR, Acer Aspire 7720 and Apple MacBook Pro.

Read more at Wikipedia.org