Can Someone Explain How PBN's work?

Hey, i was wondering if anyone could please tell me how PBNs actually work? I need a good explaination or a thread link, i searched but cant find anything so far. Thanks.

Learn everything you need to here: http://www.blackhatworld.com/blackhat-seo/black-hat-seo/697565-pbn-q-ask-me-anything-about-how-i-build-manage-rank-pbns.html

Can't find anything about PBNs you say...

Well in that case, it may be helpful to know that they work by helping to rank websites on a site called 'Google', or whimsically 'G' for short. Now, if only there were a way to find information about a specific topic, perhaps by typing things into your computer.

I mean then, you could speculate that you would have all the information that you need on PBNs and more...I dare to dream.