A binary multiplier is a mathematical tool used to quickly multiply two numbers. It works by turning the two numbers into "binary" or "base 2" numbers. A binary number is made up of only 0s and 1s. Once the two numbers are represented in binary form, they can be easily multiplied using simple logic. For example, to multiply two binary numbers, A and B, together, you would start by multiplying A x 0 (which is always 0) and writing the answer. Then you would multiply A x 1, then A x 10, then A x 11, and so on, until you have done all of the multiplications. The answers to all of these multiplications can then be added together to get the final answer.