The FBI is like the police force inside your neighborhood. If someone robs your local bank, smuggles drugs into your town, or hacks the school system, the FBI steps in. They are domestic—they handle crime that happens on American soil.
The CIA, on the other hand, is like the scout who creeps around other people's backyards to see if they’re building a dangerous shed. They collect foreign intelligence and report back to the President. They don’t arrest people or patrol America’s streets. Their job is to gather secrets overseas to prevent surprises—like a spy discovering a plot before it reaches our shores.