Hello friends, I am reading Einstein's special theory of relativity and came across this subject: Minkowski space. I cannot understand exactly what it is when i read that book and went to Wikipedia for understanding more about it. But i didn't understand much. What i understand about minkowski space is that it setup helps us to understand how Special Theory actually 'works'. It adds time as being the 4th dimension and introduces a new manifold which is called Space-time. From wikipedia,they said that : The spacetime interval between two events in Minkowski space is either: space-like, light-like ('null') or time-like. The thing that i cannot understand is what is the meaning of "Space like", "Light-like" and "Time-like" What is the difference between these three invariant space-time interval? I hope people can understand what i am saying. Just tell me what minkowski space is. I think that would help me a bit..