For questions about settings in which superluminal travel and/or communication is a possibility.
Faster-than-light, or superluminal, travel and communication is currently considered an impossibility in our world, as nothing has yet been found that can travel faster than the electromagnetic radiation that makes up all types of light. However, many sci-fi and fantasy settings consider that superluminal travel would make interactions between peoples and cultures considerably easier, so some form of this has been introduced.
This tag should be used for questions about settings where this is true. Depending on your question, it may be useful for answerers if you include a brief description of how your FTL travel works - Alcubierre drive? Wormholes? Some fantastic new particle you invented? However, this is not necessary for all questions, so use your judgment.