Five Nights at Freddy's is a popular survival horror video game series created by Scott Cawthon. The first game in the series was released in 2014 and since then, it has gained a massive following, spawning several sequels and spin-offs.

The game takes place in a fictional pizza restaurant called Freddy Fazbear's Pizza, where the player takes on the role of a security guard working the night shift. The restaurant is home to a group of animatronic animals, who entertain children during the day but seem to have a life of their own at night.

As the security guard, the player's job is to monitor the security cameras placed throughout the restaurant to keep an eye on the animatronics and make sure they don't harm anyone. However, the animatronics have a tendency to wander around at night and may attempt to enter the security office to attack the player.

The gameplay is focused on survival, with the player needing to conserve power and avoid being caught by the animatronics. The game has a tense and eerie atmosphere, with jumpscares adding to the overall horror experience.

Five Nights at Freddy's has gained a reputation for its challenging gameplay, unique premise, and its deep lore that has sparked numerous fan theories and speculation.