What exactly ARE the .pkg files that collect in the 'Receipts' folder?

Hi there all.
Those .pkg files that collect in HDD>Library>Receipts. What exactly ARE these packages for? How do they tie in with Disk Utility's 'Repair permissions' option? Why do we need to keep them?
It's all Unix to me ;0)

I used to delete .pkg files after I'd installed an application. I thought i was just the electronic equivalent of throwing away the empty box after I'd bought something.
The "cardboard box" icon encouraged me to think that.
Then someone said you should never throw away those.pkg files.
So I stopped.
But the only thing that has ever happened is that during permissions repair, I get a few lines here and there that say "could not repair permissions".
I have experienced no other problems of any kind over about the last 2 years. All applications running normally, nothing weird happening.

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