The document provides an overview of the dark net (also called the dark web). It begins by explaining that the surface web that is accessible through traditional search engines like Google only represents about 4% of total online content, while the remaining 96% is found in the deep web and darknet. The darknet is purposefully hidden and can only be accessed using special software like Tor, Freenet, and I2P. It then gives a brief history of the darknet beginning in 1970 and the development of tools like Tor. Reasons for using the darknet include protecting privacy and allowing for whistleblowing, while some also use it for computer crimes and selling restricted goods. The document concludes by describing some common darknet software