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  2. Operating system - Wikipedia

    en.wikipedia.org/wiki/Operating_system

    An operating system is difficult to define, [6] but has been called "the layer of software that manages a computer's resources for its users and their applications". [7] ...

  3. Classes of computers - Wikipedia

    en.wikipedia.org/wiki/Classes_of_computers

    Minicomputers (colloquially, minis) are a class of multi-user computers that lie in the middle range of the computing spectrum, in between the smallest mainframe computers and the largest single-user systems (microcomputers or personal computers).

  4. Computer - Wikipedia

    en.wikipedia.org/wiki/Computer

    A human computer, with microscope and calculator, 1952. It was not until the mid-20th century that the word acquired its modern definition; according to the Oxford English Dictionary, the first known use of the word computer was in a different sense, in a 1613 book called The Yong Mans Gleanings by the English writer Richard Brathwait: "I haue [] read the truest computer of Times, and the best ...

  5. Computer hardware - Wikipedia

    en.wikipedia.org/wiki/Computer_hardware

    PDP-11 CPU board. Computer hardware includes the physical parts of a computer, such as the central processing unit (CPU), random access memory (RAM), motherboard, computer data storage, graphics card, sound card, and computer case.

  6. Software - Wikipedia

    en.wikipedia.org/wiki/Software

    The integrated circuit is an essential invention to produce modern software systems. [2]The first use of the word software is credited to mathematician John Wilder Tukey in 1958. [3]

  7. Systems programming - Wikipedia

    en.wikipedia.org/wiki/Systems_programming

    Systems programming, or system programming, is the activity of programming [1] computer system software.The primary distinguishing characteristic of systems programming when compared to application programming is that application programming aims to produce software which provides services to the user directly (e.g. word processor), whereas systems programming aims to produce software and ...

  8. Computer program - Wikipedia

    en.wikipedia.org/wiki/Computer_program

    A computer program is a sequence or set [a] of instructions in a programming language for a computer to execute.It is one component of software, which also includes documentation and other intangible components.

  9. Computer cluster - Wikipedia

    en.wikipedia.org/wiki/Computer_cluster

    A simple, home-built Beowulf cluster. The desire to get more computing power and better reliability by orchestrating a number of low-cost commercial off-the-shelf computers has given rise to a variety of architectures and configurations.