Context: Springtrap and/or William Afton is a character from the video game Five Nights at Freddy’s, which is created by Scott Cawthon.
Basic gist of the character in-game is that William Afton was an engineer who killed a bunch of children and stuffed them in animatronic suits. The ghosts of these children scare William into dying in a springlock animatronic suit (a suit made of deadly springlocks) and his soul/body basically fuses to the suit in the process, which creates Springtrap.