Fourier Series. Fourier Transformation

The world has been shifting towards automation and behind every automation process, there is mathematics -Probability, Linear Algebra, Calculus, Statistics, Discrete Mathematics, etc. This is the basic question that comes into our mind and we just refer it to as something to do with graphs, sines, and cosines. But Fourier has more than that to offer us. To understand Fourier Series, let's first understand what is Periodic Function! Its importance comes later in the article.