system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What's the difference between the CIA and FBI? They seem very similar to me.
gpt
The CIA is the foreign intelligence service of the United States. Their job is to gather, process, and analyze national security information as well as perform espionage. The main difference between the CIA and FBI (of many) is that the CIA operates almost exclusively outside the United States.

The FBI is a law enforcement agency. They're essentially a police force that operates on the federal level instead of the state, county, or municipal level. Because federal crimes tend to be very serious and can impact national security, they use a lot of techniques and equipment that have more in common with intelligence agencies than most police forces.