The FBI stands for Federal Bureau of Investigation and their job is to protect you, your family, communities, and businesses from threats. For example terrorism, crime, cyber criminals, to corrupt government officials from mobsters to violent street criminals or gang members, from child predators to serial killers. They mainly investigate crime scenes, criminal bio and background, training, and other thing. The FBI sometimes train and investigate evidence in headquarters. The FBI always try their best to protect you, other people and the LAW.