In broadcasting, cancellation refers to when a radio or television program is abruptly ended by orders of the network or syndicator that distributes the show, usually against the intentions of the show's creators or producers.
Programs are typically canceled for financial reasons; low viewership or listenership will lead to lower advertising or subscription revenue, prompting networks to replace it with another show with the potential to turn a larger profit. Likewise, a disproportionately high budget is potentially undesirable (this is somewhat complicated, as prominent programs have effects on the viewership of programs that air before and after; an expensive program may be worth the cost—a loss leader—if it increases the ratings of other shows on the network, while a profitable low-budget show may still be canceled if it lowers the ratings of the surrounding programs). Other potential reasons for canceling television programs include unfavorable critical reviews, controversies involving the program's cast, conflicts among the show's staff members or to make room for new programming.
Shows whose runs end due to a mutual creative decision by its creators, producers, cast, and the network it airs on (such as Seinfeld, The Sopranos, or The Cosby Show) are not considered to be "canceled" but rather "concluded" or "ended", with a special last episode called its series finale. Even so, programs that end their runs in this manner are sometimes incorrectly stated to have been canceled, even if the program was renewed for a final season (such as with American Idol, by which the term was incorrectly applied upon the announcement of Fox, Fremantle Media and 19 Entertainment's decision to renew the show for a 15th and final season in May 2015 to air in 2016);[1][2][3] shows that are canceled traditionally end their runs during the television season in which the program airs first-run episodes at the time, either effective immediately after the announcement is made by the network or until all remaining episodes are broadcast.
The Friday night death slot is a perceived graveyard slot in American television, referring to the idea that a television program in the United States scheduled on Friday evenings is highly likely to be canceled.