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Computer | Definition, History, Operating Systems, Facts | Britannica A computer is a programmable device for processing, storing, and displaying information Learn more in this article about modern digital electronic computers and their design, constituent parts, and applications as well as about the history of computing
Computer - History, Technology, Innovation | Britannica Computer - History, Technology, Innovation: A computer might be described with deceptive simplicity as “an apparatus that performs routine calculations automatically ” Such a definition would owe its deceptiveness to a naive and narrow view of calculation as a strictly mathematical process
History of Technology Timeline | Britannica 1974: Personal computer The first computers that emerged after World War II were gigantic, but, with advances in technology, especially in putting many transistors on a semiconductor chip, computers became both smaller and more powerful Finally, they became small enough for home use
Computer - Miniaturization, Transistors, Chips | Britannica Computer - Miniaturization, Transistors, Chips: The size of transistor elements continually decreases in order to pack more on a chip In 2001 a transistor commonly had dimensions of 0 25 μm (or micrometer; 1 μm = 10−6 meter), and 0 1 μm was common in 2006
Computer - Networking, Protocols, Connectivity | Britannica Computer - Networking, Protocols, Connectivity: Computer communication may occur through wires, optical fibers, or radio transmissions Wired networks may use shielded coaxial cable, similar to the wire connecting a television to a videocassette recorder or an antenna
Computer - Supercomputing, Processing, Speed | Britannica Computer - Supercomputing, Processing, Speed: The most powerful computers of the day have typically been called supercomputers They have historically been very expensive and their use limited to high-priority computations for government-sponsored research, such as nuclear simulations and weather modeling
Computer - Technology, Invention, History | Britannica Computer - Technology, Invention, History: By the second decade of the 19th century, a number of ideas necessary for the invention of the computer were in the air First, the potential benefits to science and industry of being able to automate routine calculations were appreciated, as they had not been a century earlier
Computer - Hobby, Expansion, Technology | Britannica Computer - Hobby, Expansion, Technology: Some entrepreneurs, particularly in the San Francisco Bay area, saw opportunities to build add-on devices, or peripherals, for the Altair; others decided to design competitive hardware products
Computer - Memory, Storage, Processing | Britannica Computer - Memory, Storage, Processing: The earliest forms of computer main memory were mercury delay lines, which were tubes of mercury that stored data as ultrasonic waves, and cathode-ray tubes, which stored data as charges on the tubes’ screens