Billy Graham, one of the early televangelists. This photo is from 1966.
Televangelism is the use of modern mass media such as television or radio to speak of the faith. Usually this is done to convince other people of one's own beliefs. It is common with Christianity but also occurs with other religions. The word is a made up of television and evangelism. The term was started by Time magazine. Today it is also used for preachers who use modern mass media, such as radio, or the internet to spread the gospel.