"Pirate radio" refers to an illegal radio station that operates without a license and usually plays music not available on mainstream radio. Some other synonyms for pirate radio include "bootleg radio," "underground station," "unauthorized broadcaster," "clandestine radio," and "rogue radio." These terms all refer to radio stations that operate outside the bounds of official regulation, and often broadcast from hidden or makeshift locations to avoid detection by authorities. While pirate radio may be illegal, it can also serve as a platform for alternative voices and music that may not have an outlet on traditional radio stations.