Multiply-Accumulate Operation (MAC)

In computing, especially digital signal processing, the multiply–accumulate operation is a common step that computes the product of two numbers and adds that product to an accumulator. The hardware unit that performs the operation is known as a multiplier–accumulator (MAC, or MAC unit); the operation itself is also often called a MAC or a MAC operation.

Reference: https://en.wikipedia.org/wikiMultiply-accumulate_operation