# Fourier Series

A Fourier series is an expansion of a periodic function in terms of an infinite sum of sines and cosines.

Fourier series is a college-level concept that would be first encountered in an analysis course.

### Prerequisites

Power Series: | A power series is a sum of powers of a variable. A power series is essentially an infinite polynomial. |

Taylor Series: | A Taylor series is a power series of a function around a given point. |