Cell polarity is a fundamental characteristic regarding cell motility and division. In this work, first we analyze polarization from a biological vantage point, namely which are the molecules taking part on it and how it is experimentally observed. Then, we evaluate this mechanism by implementing a simple mathematical model, so that the fundamental concepts can be understood, and afterwards, a more complex modelization is analyzed, involving the kinetics of two proteins, so that we show how a simplified two-variable model can reproduce the symmetry breaking needed for polarity. Finally, the validity of this model is considered 2021/2022