Treballs Finals de Grau de Matemàtiques, Facultat de Matemàtiques, Universitat de Barcelona, Any: 2019, Director: Jordi Marzo Sánchez[eng] In this end-of-grade project, we will study the random graphs defined by Erdös and Rényi, with the objective of using them to generate models that help us to study the behavior of the Web. We will also do a brief analysis on another model called LCD PA. To carry out this work, we will review both the theory of graphs and probabilities, as well as describing the properties and characteristics of the graph W , which represents the Web