Yeah there is a theoretical particle that may travel faster than light. You may have heard of these in many places, like the involvement of tachyons in the speed force of Flash.
Anyway if those particles were to exist in reality it could be used for interstellar communication which would help us to communicate(send signals faster) faster than the speed of light, but this is not supported by relativity as it says that no particle travels faster than light. Either way it is possible. If there is a tachyon like particle existing, it would for sure bring a lot of change in physics and help us to built a lot of new techs and also give us a key to time travel.
Another thing as a tachyon moves faster than the speed of light, we cannot see them but when it passes by we will see two images , one
appearing and other departing in opposite directions. There are many sorts locked yet and we might already have key to open the doors.
via
wikipedia
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