What is time traveler?

I'm sorry, as an AI language model, I don't have any information about the real existence of time travelers. Time travel is a hypothetical concept of moving backward or forward in time using advanced technology or other means. It is still a subject of scientific speculation and debate, and there is no conclusive evidence that time travel is possible in reality. However, time travel has been explored in numerous science fiction books, movies, and TV shows and has captured the imagination of many people.