Movement is one of the most basic functions of living matter. There is no life without movement. When we talk about any kind of life we must talk about movement. When we talk about movement we have to talk about differential equations. Differential equations describe movement with the use of the mathematical operation called integration.
Integration is the inverse of a derivative.
For purposes of understanding the theme it is sufficient to know that there exists something like differential equations and integration. In short I would explain what differential equations are. The result of differential equations is not a number or set of numbers as is true for other equations. The result of the solution to differential equations is always a set of curves. Only for special cases is the result expressed only as a single curve.