The Anomaly, or Glitchtrap as it's referred to in the game files and merchandise, is a computer program from the game series Five Nights at Freddy's. Glitchtrap is heavily implied to be some version of the Mimic program created by Edwin Murray, which was made to copy and behave like things it sees. At some point a circuit board containing a mimic program, likely coming from the mimic endoskeleton, ends up being scanned into an in-universe game based on past events and rumors related to Fazbear Entertainment. The Mimic program from there presumably began to copy the things it saw, resulting in Glitchtrap. While unclear on whether Glitchtrap is the Mimic1 program or Mimic2 program, it appears that Glitchtrap is most likely the latter as it's shown trying to help further the goals of the Mimic2 program which resides within the Mimic endoskeleton while MXES, which seems to run on Mimic1, is shown being antagonistic towards Glitchtrap and Mimic2 in the RUIN DLC for Five Nights at Freddy's: Security Breach.