Security agencies are organizations responsible for protecting a nation's interests, citizens, and infrastructure. They work to prevent and respond to threats such as crime, terrorism, and espionage. Examples of security agencies include the FBI in the United States and MI5 in the United Kingdom, which focus on domestic security and intelligence. These agencies gather information, conduct investigations, and collaborate with other law enforcement and intelligence organizations. They also develop strategies to enhance public safety and national security. By employing various methods, including surveillance and analysis, security agencies aim to maintain order and protect the community from potential dangers.