different+types+of+computers

=different types of computers= done by ulemu shawa and zainab aboobaker.
 * types**
 * Personal computers
 * Desktop
 * Laptop
 * Main frame
 * Palmtop/ P.D.A

**__personal computer:__**  · ** A personal computer ** (**PC**) is any general-purpose computer whose size, capabilities, and original sales price make it useful for individuals, and which is intended to be operated directly by an end user, with no intervening computer operator. · A personal computer may be a desktop computer, a laptop, tablet PC or a handheld PC (also called **palmtop**). · The most common microprocessors in personal computers are x86-compatible CPUs. · Software applications for personal computers include word processing, spreadsheets, databases, Web browsers and e-mail clients, games, and special-purpose software. · Modern personal computers often have high-speed or dial-up connections to the Internet, allowing access to the World Wide Web and a wide range of other resources. · A PC may be used at home, or may be found in an office. Personal computers can be connected to a local area network (LAN) either by a cable or wirelessly. · While early PC owners usually had to write their own programs to do anything useful with the machines, today's users have access to a wide range of commercial and non-commercial software which is provided in ready-to-run form. **__Desktop__** A desktop computer is a personal computer (PC) in a form intended for regular use at a single location, as opposed to a mobile laptopp or portable computer. Prior to the widespread use of microprocessors, a computer that could fit on a desk was considered remarkably small. Desktop computers come in a variety of types ranging from large vertical tower cases to small form factor models that can be tucked behind an LCD monitor. "Desktop" can also indicate a horizontally-oriented computer case usually intended to have the display screen placed on top to save space on the desktop. Most modern desktop computers have separate screens and keyboards. **__laptops__**

· A **laptop** is a personal computer designed for mobile use and small and light enough to sit on a person's lap while in use__. __ · A laptop integrates most of the typical components of a desktop computer, including a display, a keyboard, a pointing device (a touchpad, also known as a trackpad, and/or a pointing stick), speakers, and often including a battery, into a single small and light unit. · The rechargeable battery (if present) is charged from an AC adapter and typically stores enough energy to run the laptop for two to three hours in its initial state, depending on the configuration and power management of the computer. · But today, there are already more laptops than desktops in businesses, and laptops are becoming useful for student use and more popular for general use. · In 2008 more laptops than desktops were sold in the US and it has been predicted that the same milestone will be reached in the worldwide market as soon as late 2009




 * __main frame__**
 * Mainframes are computers used mainly by large organizations for critical applications, typically bulk data [[image:http://t0.gstatic.com/images?q=tbn:ANd9GcQXkknqAVGLrk23Z5Rc2Vavx0pc-y_Zn0gxyS7O8NYCzzfpL-o&t=1&usg=__Pu_ni2yeFqHQ2CQlB_vSuTVDCCo= width="259" height="194" align="right"]]

processing such as census industry and consumer statistics, enterprise resource plannning, and financial transaction processing The term originally referred to the large cabinets that housed the central processing unit and main memory of early computers. However, "enterprise server and "mainframe" are becoming synonymous __**P.D.A **__ A **personal digital assistant (PDA)**, also known as a **palmtop computer**, is a mobile device which functions as a personal information manager nd has the ability to connect to the internet. The PDA has an electronic visual display enabling it to include a web browser, but some newer models also have audio capabilities, enabling them to be used as mobile phones or portable media players. Many PDAs can access the internet, intranets or extranets via Wi-Fi, or Wireless Wide Area Networks (WWANs). Many PDAs employ touch screen technology.
 * Later the term was used to distinguish high-end commercial machines from less powerful units.
 * In 2009, the term refers to computers compatible with theIBM System\360 line, first introduced in 1965. (IBM System z10 is the latest incarnation.)
 * Otherwise, large systems that are not based on the System/360 but are used for similar tasks are usually referred to as servers.
 * Otherwise, large systems that are not based on the System/360 but are used for similar tasks are usually referred to as servers.
 * Many defining characteristics of "mainframe" were established in the 1960s, but those characteristics continue to expand and evolve to the present day.