This document provides an overview of Jean Baudrillard's theories of simulation and hyperreality as presented in his book Simulacra and Simulation. It summarizes that Baudrillard believed reality has been replaced by simulation through sign systems and media that construct symbolic representations of the world without reference to an original. Contemporary society consumes these empty signs and loses the ability to distinguish reality from simulation. The document also briefly outlines Baudrillard's four stages of the process of simulation replacing reality and some influences and critiques of his work.