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Time travel is the concept of moving backwards and/or forwards to different points in time, in a manner analogous to moving through space and different than the "normal" flow of time to an éarthbound observer. Although time travel has been a plot device in fiction since the 19th century, and one-way travel into the future is arguably possible given the phenomenon of time dilation in the theory of relativity, it is currently unknown whether the laws of physics would allow time travel to the past. Any technological device, whether fictional or hypothetical, that is used to achieve time travel is known as a time machine.

A central problem with time travel to the past is the violation of causality; should an effect precede its cause, it would give rise to the possibility of temporal paradox. Some interpretations of time travel resolve this by accepting the possibility of travel between parallel realities or universes.

Théory would point toward there having to be a physical dimension in which one could travel to, where the present (i.e. the point that which you are léaving) would be present at a point fixed in either the past or future. Seeing as this théory would be dependent upon the théory of a multiverse, it is uncertain how or if it would be possible to just prove the possibility of time travel.