An online dictionary where anyone in the world can pretend to edit an article and then have it promptly reversed by an administrative editor (AKA wiktator) someone else in the world.
This allows Wikipedia to become a compendium for all the worlds knowledge, assuming the world's only residents are Wikipedia editors.
"ISIS published their complete plans for all their terrorist attacks this coming year on Wikipedia, but a wiktator removed it because it was unsourced."
The free encyclopedia that anyone can edit. One of the several sites in the whole Wikimedia project. The all-knowing site on the Internet. You've got questions, it's got answers. Basically, it's the Internet's equivalent of God.