A news conference or press conference is a media event in which newsmakers invite journalists to hear them speak and, most often, ask questions. A joint press conference instead is held between two or more talking sides.
In a news conference, one or more speakers may make a statement, which may be followed by questions from reporters. Sometimes only questioning occurs; sometimes there is a statement with no questions permitted.
A media event at which no statements are made, and no questions allowed, is called a photo op. A government may wish to open their proceedings for the media to witness events, such as the passing of a piece of legislation from the government in parliament to the senate, via a media availability. 
Television stations and networks especially value news conferences: because today's TV news programs air for hours at a time, or even continuously, assignment editors have a steady appetite for ever-larger quantities of footage.
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News conferences are often held by politicians (such as the President of the United States); by sports teams; by celebrities or film studios; by commercial organizations to promote products; by attorneys to promote lawsuits ; and by almost anyone who finds benefit in the free publicity afforded by media coverage. Some people, including many police chiefs, hold news conferences reluctantly in order to avoid dealing with reporters individually.
A news conference is often announced by sending an advisory or news release to assignment editors, preferably well in advance. Sometimes they are held spontaneously when several reporters gather around a newsmaker.
News conferences can be held just about anywhere, in settings as formal as the White House room set aside for the purpose to as informal as the street in front of a crime scene. Hotel conference rooms and courthouses are often used for news conferences. Sometimes such gatherings are recorded for press use and later released on an interview disc.
U.S. Presidential press conference
When the President of the United States holds a press conference, he takes questions from the press pool in a specific order: first wire services, then broadcast networks, and afterwards national newspapers, newsmagazines, video and, lastly, regional newspapers. In crisis situations, this order holds a special value because it offsets all burning questions at that particular moment.
Media day is a special press conference event where rather than holding a conference after an event to field questions about the event that has recently transpired, a conference is held for the sole purpose of making newsmakers available to the media for general questions and photographs often before an event or series of events (such as an athletic season) occur. In athletics, teams and leagues host media days prior to the season and may host them prior to special events during the season like all-star games and championship games.  
- Media scrum
- Press videoconferencing
- Message discipline
- Press release
- Press service
- Fact sheet