This document provides an introduction to hackers and hacking. It discusses the history and definitions of key terms like "hacker" and "cracking". It also outlines different types of hackers like grey hat, black hat, and white hat hackers. The document discusses famous hacker groups like Anonymous and provides overviews of computer crimes, hacking tools, and the free software movement. It aims to serve as a general reference on the topic of hackers, hacking, and computer security.