What does the 'tradgedy of the commons" refer to?

Answer; Explanation:

The tragedy of the commons is a situation in a shared-resource system where individual users, acting independently according to their own self-interest, behave contrary to the common good of all users by depleting or spoiling the shared resource through their collective action.

I believe it is the idea that one person who takes more than his or her share in a system of voluntary restraint will ruin the entire system