This document provides an introduction to ethical hacking. It defines information security and the CIA triad of confidentiality, integrity and availability. It discusses the difference between ethics and hacking, and defines ethical hacking as locating vulnerabilities with permission to prevent attacks. The document outlines the types of attackers and the typical steps attackers take including reconnaissance, scanning, gaining access, maintaining access, and covering tracks. It discusses the benefits of ethical hacking for organizations and some disadvantages. Finally, it provides examples of using Google to find security issues on websites.