Possible reasons of Ban

overview

[Peng]

What is google ban?
How to know if a site is ban or just de-indexed compltetely?
What could be the possible reasons of google band?

[Quadrille]

Google has terms and conditions of service.

If they feel your site does not fit with these terms, your site may be removed from their listings.

They publish full details on their web site:
Webmaster Help Center [google.com]