A laptop (notebook) is a personal computer designed for mobile use. A laptop integrates most of the typical components of a desktop computer, including a display, a keyboard, a pointing device (either a touchpad, also known as a trackpad, and/or a pointing stick) and speakers into a single unit.
A laptop is powered by mains electricity via an AC adapter, and can be used away from an electricity outlet using switching to and using the power stored in its rechargeable battery. A laptop battery in new condition typically stores enough energy to run the laptop for three to five hours, depending on the computer usage, configuration and power management settings.
When the laptop is plugged into the mains, the battery charges, whether or not the computer is running. A problem with laptop batteries, is that as it ages the battery's energy storage will progressively dissipate to last only a few minutes. They are considered as consumables and must therefore be replaced.
A desktop-replacement computer is a laptop that provides most of the capabilities of a desktop computer, with a similar level of performance. Desktop replacements are usually larger and heavier than standard laptops. They contain more powerful components and have a 15" or larger display. They are bulkier and not as portable as other laptops, and their operation time on batteries is typically shorter; they are intended to be used as compact and transportable alternatives to a desktop computer.
Netbooks are laptops that are light-weight, economical, energy-efficient and especially suited for wireless communication and Internet access. Hence the name netbook (as "the device excels in web-based computing performance").
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