In a general sense, most of us do that every day without pretending – we travel from one second to another. But time travelers are special – they have the ability to move from one point in time to another faster or slower than what us normal humans can do. They can travel in the past or travel in the future.
Did you know that one of the most popular paradox associated with time travel is the Grandfather Paradox? According to this paradox, if a person goes back into time to kill her/his grandfather before he has biological children and succeeds, then one of the person’s parents would never be born, and therefore, the person in question would not exist.