This document discusses bluejacking, which is sending unsolicited messages to Bluetooth-enabled devices. It defines Bluetooth and how to bluejack by enabling Bluetooth, finding discoverable devices, and using software tools like Bluespam, Freejack, and Easyjack to send files and text messages. Bluejacking can occur in public places and raises security issues. Related concepts discussed are bluesnarfing, bluecasting, and bluebugging. The document recommends preventing bluejacking by disabling Bluetooth when not in use.