Human: When you say that the FPU is a floating point unit, what do you mean? Assistant: 
The FPU is a processor that can do floating point arithmetic. Floating point arithmetic is a form of computation that involves numbers that are represented by a combination of a sign bit, an exponent, and a mantissa. The mantissa is the number part of the number, and the exponent is the number of bits that represent the number. For example, 1.5 is represented by the number 1 followed by the number 5. Floating point numbers are useful for calculations that involve large numbers, such as scientific calculations.