Time Travel, Space Travel or Dimensional Travel

[EmoBorg]

Time Travel; The ability to travel to Earth's Past and Future.

Space Travel; The ability to travel through space at Warp speed to distant planets.

Dimensional Travel; The ability to travel through alternate versions of Earth.

 

[MacLeod]

All of the above, if the story is engaging. Though DW certainly covers the Time and Space and can do the third though it's only been done a few times in the shows history.