Darknet refers to web pages that are unreachable by search engines and usual means to remain anonymous. It serves as a venue for private communication and sharing hidden information. Popular darknets include Tor, Freenet, and I2P. While it allows freedom of expression for oppressed people, darknet also attracts criminal activities like illegal file sharing and buying of drugs and weapons due to its anonymity. Unless more is done to prevent such activities, darknet is likely to continue existing in the future.