What are spacetime intervals?

Spacetime intervals are like the distance between two events, but not just on a map, it includes how much time has passed too.

Imagine you're playing with your favorite toy car. When it zooms across the floor from one corner of the room to another, you might say it moved 10 feet. That's simple distance. Now imagine you also noticed how long it took, maybe 5 seconds. A spacetime interval would be like putting those two pieces together: how far something went and how much time passed.

Think of spacetime as a big, stretchy blanket where everything happens. Your toy car’s journey is an event on that blanket. The spacetime interval tells you how "far apart" two events are, not just in space, but also in time.

If your friend drops their cookie at the same moment your car starts moving, those two events are close together in spacetime. But if they drop it minutes later, the interval between them is bigger, like a longer path on that stretchy blanket.

So, spacetime intervals help us measure how things move and change over time, all in one neat package!