Human: Could you help me understand calculus? Assistant: 
Sure, I can try to explain it. Calculus is a branch of mathematics that deals with the study of functions and their derivatives. It's used in many different fields including engineering, physics, economics, and biology. In calculus, we use equations to describe how things change over time. For example, if you have a function f(x) = x2, then the derivative of this function would be f'(x) = 2x. This means that as x changes, so does f(x). The derivative is also known as the instantaneous rate of change.