system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What kind of things does MI6 and the Secret Service actually do?
gpt
The Secret Service is in charge of investigating counterfeiters, and provide protection services for the President, Vice President, Senators, Congressmen, and various other Dignitaries and their families in the US. 

MI6 is the British Foreign intelligence Service. They spy on other countries, and attempt to counter spies in Britain though that is the primary purpose of MI5. The US counterpart to MI6 would be the CIA, and the counterpart to MI5 would be both the FBI and NSA.