the difference between the concept of time and the concept of spaceTIME.
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Extremely simplified version:
The universe has an absolute speed limit(the speed of light) that nothing can exceed. Because of this it is possible in some situations to treat space and time as interchangeable concepts.
Example: An event occurs 1 lightsecond away from you(lightsecond = a measure of distance = space). Because of the absolute speed limit it will take at least 1 second for you to see or feel any of the effects of that event, thus you could say that the event takes place 1 second into the future(time).
“But wait” you say, “that’s just an artifact of perspective, surely in reality the event happens in this moment and not in the future.” Well, what is “reality” really? In science “reality” consists of that which is observable, things that can never be observed or interacted with effectively do not exist. And remember this speed limit is absolute, nothing can break it, thus there is no possible way for you to observe this event faster than one second from now.
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