ELI5: Explain Like I'm 5

No-deleting theorem

Alright kiddo, have you ever accidentally deleted something you really needed? Well, there's this thing called the no-deleting theorem that says that once you delete something, you can never really get it back completely.

It's like if you had a toy and you broke it, even if you try to put it back together with glue, it will never be exactly the same as it was before. And sometimes, depending on how badly it's broken, it might not be able to be fixed at all.

This is the same with deleting things on a computer or phone. When you delete something, it might seem like it's gone forever, but it's actually still there in some form. And just like with the broken toy, trying to put it back together might not work perfectly.

The no-deleting theorem is just a fancy way of saying that even when you think you've deleted something, there might still be traces of it left. This can be a scary thought, but it's also important to remember that there are ways to protect your important files and data so that you don't accidentally delete them in the first place.

So there you have it, kiddo, the no-deleting theorem means that deleted things can't always be completely recovered, just like broken toys can't always be completely fixed. But don't worry, there are ways to keep your stuff safe!