system
Given the following post, respond as if you're commenting on Reddit:
human
What is the space time continuum?
gpt
Imagine a completely empty square room.  One corner has a black dot in it, just so you can distinguish it from the other corners, and then the 3 walls that meet at that dot are colored red, yellow, and blue.  Now you can place a ball *anywhere* in the room, and then measure it "x-feet from the red wall, y-feet from the blue wall, and z-feet from the yellow wall" and that will give you the coordinates of the ball.  

Now imagine if you took the same ball and threw it around the room.  In order to locate the ball now you don't just have to say where it is, but also *when* it is there. "x-feet from the red wall, y-feet from the blue wall, z-feet from the yellow wall, and t-seconds after you threw it".   

So really, space-time is just a way of locating objects in the universe by both their location related to other objects in space and their location related to other events in time.  The term space-time-continuum is just a way of saying that when doing math about predicting where an object will be you have to treat time somewhat like the other dimensions in order to give the location of an object.