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A laptop computer (also known as notebook computer) is a small mobile
personal computer, usually weighing around from 1 to 3 kilograms
Notebooks smaller than an A4 sheet of paper and weighing around 1 kg are termed subnotebooks and those weighing
around 5 kg a desknote - desktop/notebook
A Tablet PC is a computer shaped in the form of a notebook except with the capabilities of
being written on through the use of Digitizing Tablet technology or a Touch screen. A user can use a stylus and
operate the computer without having to have a keyboard or mouse
Laptops are capable of many of the same tasks that desktop computers perform, although they are typically less
powerful. Laptops contain components that are similar to those in their desktop counterparts and perform the same
functions but are miniaturized and optimized for mobile use and efficient power consumption. Laptops usually have
LCD displays and smaller SODIMM (Small Outline DIMM) chips for their RAM. In addition to a built-in keyboard, they
may utilize a touchpad or a pointing stick for input, though an external mouse or keyboard can usually be attached
Current models use LiIon batteries, which have largely replaced the older NiMH technology. Typical battery life
for most laptops is two to five hours with light-duty use, but may drop to as little as one hour with intensive use
Batteries gradually degrade over time and eventually need to be replaced, commonly after two to five years
Most modern laptops use an active matrix display, with screen sizes 350 mm or larger, and have PCMCIA
expansion bays for expansion cards. Internal hard disks are smaller—64 mm compared to the standard
desktop 90 mm drive—and have lower performance. Display adapters and sound cards are integrated. Modern
laptops can often handle sophisticated games but tend to be limited by their fixed screen resolution and display
adapter type. Docking stations are used for expanding connectors and quickly connecting many components to the laptop
Laptops generally cost around twice as much as a desktop machine of similar specification. Performance is always
lower than that of a comparable desktop because of the compromises necessary to keep weight and power consumption
low. Upgradability is severely limited: typically only the RAM and hard drive can be changed. Because nearly all
functions are integrated into the proprietary-design mainboard to save space and power, laptops are essentially
non-repairable. Unless the unit is under warranty, the cost of repairing even a minor fault is close to
the cost of simply buying a completely new laptop
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