Mass communication involves using print or electronic media like newspapers, magazines, films, radio or TV to communicate with large, scattered audiences. It emerged in the early 20th century as societies industrialized, urbanized and modernized. Mass communication aims to inform, entertain and persuade large numbers of people. The roles of mass media in development communication include surveillance of the environment, correlating different parts of society, transmitting social heritage, educating the masses, providing entertainment, and mobilizing people to advance national development. Effective mass communication integrates and fosters social interaction by providing insight into others' lives and cultivating social empathy.