Five Nights at Freddy's, or FNAF, is a super popular horror video game series. It takes place in a spooky pizza restaurant called Freddy Fazbear's Pizza, where animatronic characters come to life at night and try to scare you. The goal is to survive five nights as a security guard by monitoring the cameras and keeping an eye on the animatronics. It's a thrilling and suspenseful game that keeps you on the edge of your seat. Just be prepared for some jump scares.