A specialization of computational system, electronic device, and computer hardware. Each instance of computer is an electronic device that acts on input according to some set of instructions (often in the form of software -- see computer program) producing some output. Instances of computer have specialized parts to handle input and output (sometimes peripherals like screens and keyboards, sometimes just input-output terminals on a chip), storage (internal memory and external storage such as disk drives), and reasoning (see central processing unit). The more specialized collection personal computer is the collection of the popular archetypes of what a computer is (e.g., desktop, laptop, and palm computers); however, instances of computer are incorporated into many devices (e.g., cars, cameras, and VCRs). Hydraulic computers, analog computers, biological computers, etc. are not instances of this collection because computer is a specialization of electronic device.