The press box is a special section of a sports stadium or arena that is set up for the media to report about a given event. It is typically located in the section of the stadium holding the luxury box. In general, newspaper writers sit in this box and write about the on-field event as it unfolds. Television and radio announcers broadcast from the press box as well.
The press box is considered to be a working area, and writers, broadcasters, and other visitors to press boxes are constantly reminded of this fact at sporting events. Cheering is strictly forbidden in press boxes, and anyone violating rules against showing favoritism for either team is subject to ejection from the press box by security personnel. The rule against cheering is generally enforced only in the writers' area of the press box, as broadcasters are usually employed by one of the teams involved.
It also refers to a "scratched" or injured player, who is said to be "watching from the press box".