PC
The personal computer (PC) is small in size and is designed for general use by a simple person.
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A PC that is not designed for portability. A desktop computer is typically set up in a permanent location.
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Laptop
A portable computer that includes a battery to provide power for some specific period of time.
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Palmtop
More commonly known as personal Digital Assistant (PDA). Palmtops are small, lightweight and tightly integrated computers which usually do not have keyboards but rely on tough screen technology for user input. Palmtops are equipped with a battery with reasonable life.
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Workstation
A desktop computer with a powerful processor, additional memory and enhanced capabilities for performing a special group of takes, such as 3D graphics.
Server
A computer that has been optimized to provide services to other computers over a network. Servers usually have powerful processors, lots of memory and large hard drives.
Mainframe
Mainframes are huge computers, which could fill an entire room or even a whole floor. Over the years, the size of computers has diminished while the power has increased. The term mainframe has fallen out of use. You will still hear the term used, practically in large companies to describe the huge machines processing millions of transactions everyday.
Supercomputer
This type of computer is usually are very expensive. Although some supercomputers are single computer systems, most are comprised of multiple high performance computers working in parallel as a single system. The best - known supercomputers are built by cray supercomputers.
Different Type of Computer memory
The programs and data must be in the main memory to be used by the CPU. The main memory is the only large storage area that the CPU can access derectly. Memory of a computer is measured in Megabites.
The three basic types of memory used in a computer are Cach Memory,Random accesss Memory (RAM) and Read only Memory (ROM).
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