FNaCThe Monitor is what the player uses to check through the cameras to know the whereabouts of the Animatronics within the Restaurant.
The player also uses this to help survive, as the player will know the animatronics' locations, meaning that they aren't in the Office, but if they aren't seen on any cameras, the player will have to check the Doors.
If the player doesn't move or go into the Monitor for a certain amount of time, an animatronic will automatically jumpscare the player.
The Monitor also has a feature called Night Vision which is meant to brighten a room anywhere in the diner (except for the Kitchen), switching off the Night Vision will leave the screen pitch black, and will only be able to know if an animatronic is there if their iris is glowing in the darkness (such as Candy, Cindy, Penguin and Chester).
In Five Nights at Candy's 2, the monitor is replaced by Marylin Schmidt's smart phone, which is used to access the various cameras around the Robot Factory and allows the player to lure animatronics around the location by using the phones found all rooms but the Central Hall, which replaces the Office in this game.