A headline is the title of a newspaper story, printed in large letters at the top of the story, especially on the front page.

The headlines are the main points of the news which are read on radio or television.

If a newspaper or magazine article is headlined a particular thing, that is the headline that introduces it.

If someone headlines a show, they are the main performer in it.

Someone or something that hits the headlines or grabs the headlines gets a lot of publicity from the media.