Time travel is a common theme in science fiction and is depicted in a variety of media. It simply means either going forward in time or backward, like seeing the future, or the past.
Time travel can form the central theme of a book, or it can be simply a plot device. Time travel in fiction can ignore the possible effects of the time-traveler's actions, as in A Connecticut Yankee in King Arthur's Court, or it can use one resolution or another of the Grandfather paradox.
Although The Time Machine by H. G. Wells was instrumental in causing the idea of time travel to enter the public imagina...read more on Wikipedia