To travel faster than the speed of light is to travel forward in time. Hypothetically and theoretically, tachyons are able to do this, as they have an imaginary mass (the square root of minus one: √−1 ), but tachyons in all likelihood aren't a thing. The rest of us travel forward in time at exactly the speed of whatever time is.
Einstein's special theory of relativity states that a finite speed of light protects us from time travel: without it, we could wander around in time essentially the same way we can wander around in space. This protects the past from the future; it's up to us to protect our future from the past.
(all errors are my own)
both photographs credit KGG