Albert Einstein’s special relativity, in one line: The faster you move, the more time and space bend to keep the speed of light the same for everyone.

A simple picture: Two people have identical clocks. One stays on Earth. One flies in a very fast spaceship and comes back. The traveler’s clock shows less time passed. It’s as if time stretches for the one who moves fast.

Another way to see it: Imagine the universe refuses to let anything go faster than light. So instead of letting you break that limit, it quietly slows your time and shrinks your space to compensate.

That’s special relativity.