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In computing, an arithmetic logic unit (ALU) is a digital circuit that performs arithmetic and logical operations. The ALU is a basic building block of the central processing unit (CPU) of a computer, even the simplest microcontrollers contain one for purposes such as timing.
Now, modern microprocessors, microcontrollers and CPUs have very powerful and very complex ALUs. Also, more recent CPUs may contain up to more than 4 ALUs (see superscalar CPUs).
Mathematician John von Neumann proposed the ALU concept in 1945.
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