Since no one has actually explained it like you’re five, here’s my take.
Cybersecurity experts and hackers are essentially at war. For simplicity sake, lets call them “good guys” and “bad guys”.
The good guys build a new tank and the bad guys try to figure out how to destroy it.
So bad guys build a new missile that can tear through the tanks armor and the good guys make new armor and outfit all of the tanks with it.
Then the bad guys design a new type of explosive that can get through the new armor and the good guys design a new defense to protect it. They go back and forth like this for a few years until the tank is pretty much maxed out.
So the good guys roll out a new tank with a better design, fewer flaws, and more defenses and start a new generation of trying to beat each other.
Eventually, the good guys stop upgrading their old tanks because it’s not worth it and most have been decommissioned anyway.
So now any good guys who use old tanks are SOL.
That’s it.
After a while, patching old OSs isn’t worth it.
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