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A general purpose computer has four main components: the arithmetic and logic units (ALU), the control unit, the memory, and the input and output devices (collectively termed I/O). These parts are interconnected by busses, often made of groups of wires.
The control unit, ALU, registers, and basic I/O (and often other hardware closely linked with these) are collectively known as a central processing unit (CPU). Early CPUs were composed of many separate components but since the mid-1970s CPUs have typically been constructed on a single integrated circuit called a microprocessor.
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The control unit, ALU, registers, and basic I/O are collectively known as …
a general purpose computer
a microprocessor
groups of wires
a central processing unit