It’s basically government security for the president and vice president as well as all former ones because we have a long history of shooting our presidents. They also investigate counterfeiting which was their original job, they just happened to be formed shortly before the first successful presidential assassination
Secret Service is regular security for a vice president.
I suppose as a non American my idea of what the secret service actually is / does may be a little skewed by Hollywood
The secret service exists to prevent counterfeiting US money, as a side job they also protect a few people in government.
It’s basically government security for the president and vice president as well as all former ones because we have a long history of shooting our presidents. They also investigate counterfeiting which was their original job, they just happened to be formed shortly before the first successful presidential assassination