In 2007, the independent horror film "Paranormal Activity" took the world by storm, grossing over $193 million worldwide on a meager $15,000 budget. Oren Peli's low-budget masterpiece revitalized the found-footage genre, paving the way for a new wave of horror movies. This essay will examine the film's impact on the horror genre, its innovative use of found footage, and the reasons behind its massive success.