
Computer | Definition, History, Operating Systems, & Facts | Britannica
Dec 10, 2025 · A computer is a machine that can store and process information. Most computers rely on a binary system, which uses two variables, 0 and 1, to complete tasks such as storing data, …
computer - Kids | Britannica Kids | Homework Help
Computer software is divided into two basic types—the operating system and application software. The operating system controls how the different parts of hardware work together. Application software …
Control unit | Definition & Facts | Britannica
Control unit, subcomponent of a central processing unit (CPU) that manages a computer’s operations. The control unit fetches instructions from the CPU’s memory, represented in bits, and translates …
Central processing unit (CPU) | Definition & Function | Britannica
Nov 29, 2025 · Central processing unit (CPU), computer system, generally composed of the main memory, control unit, and arithmetic-logic unit. It constitutes the physical heart of the entire computer …
Computer - History, Technology, Innovation | Britannica
Dec 10, 2025 · Computer - History, Technology, Innovation: A computer might be described with deceptive simplicity as “an apparatus that performs routine calculations automatically.”
Computer architecture | Definition & Facts | Britannica
Nov 11, 2025 · Computer architecture, structure of a digital computer, encompassing the design and layout of its instruction set and storage registers. The architecture of a computer is chosen with …
Digital computer | Evolution, Components, & Features | Britannica
Oct 17, 2025 · A typical digital computer system has four basic functional elements: (1) input-output equipment, (2) main memory, (3) control unit, and (4) arithmetic-logic unit.
Computer memory | Types, Capacity & Speed | Britannica
Oct 31, 2025 · Computer memory is divided into main (or primary) memory and auxiliary (or secondary) memory. Main memory holds instructions and data when a program is executing, while auxiliary …
Password | Passcode, Cybersecurity, Facts, & Description | Britannica
Password, in computing, a sequence of characters used to authenticate a user’s identity and authorize access to a computer system, website, mobile phone, or other digital device.
Operating system (OS) | Definition, Examples, & Concepts | Britannica
Nov 21, 2025 · Operating system, program that manages a computer’s resources, especially the allocation of those resources among other programs.