The purpose of the Pierre Auger Observatory is to study the highest energy cosmic rays which arrive to the earth. Due to the high occurrence, low-energy cosmic rays have been relatively well understood in the 100 years since their discovery. However, cosmic rays at higher energies are much rarer. Also, primary cosmic rays can never be directly observed, and must be researched instead through the properties of the air showers which they produce in our upper atmosphere. The Pierre Auger Observatory is an international Collaboration, involving 18 countries, to study the highest energy cosmic rays. The site is located near the city of Malargüe (province of Mendoza, Argentina), in a place named Pampa Amarilla, spanning across the Malargüe and San Rafael Departments and covers 3000 square kilometers. The experiment consists of 1600 particle detectors and four atmospheric fluorescence detector. The scientific objective is to measure the arrival direction, energy, and mass composition of highest energy cosmic ray air showers in order to try to answer open questions about their origin and propagation.