In sports broadcasting, a sports commentator (also known as a sports announcer or sportscaster) provides a real-time live commentary of a game or event, traditionally delivered in the present tense. Radio was the first medium for sports broadcasts, where the radio commentators had to describe the action in detail because the listeners could not see it for themselves. In the case of televised sports coverage, commentators are presented as a voiceover, with images of the contest shown on viewers' screens and sounds of the action and spectators heard in the background. Television commentators are rarely shown on screen during an event, though some networks choose to feature their announcers on camera either before or after the contest or briefly during breaks in the action.