When ministers and preachers use TV to broadcast their sermons (and raise funds), it's known as televangelism. Since the 1950s, televangelism has brought church services to people in their homes.
Televangelism comes from televangelist, which was coined in 1973. Earlier, television ministers were known as "television evangelists." American evangelical Protestants have made the most use of this format ever since the earliest days of televangelism, which was made possible by loosely regulated media and a large U.S. population of Christians. Though their audiences are smaller, Muslims and Hindus also share religious services through televangelism.