Google Sandbox
If your blog contents have been indexed by Google for long and performed well for many keywords in Google SERP (search engine result page) and all of a sudden your good honeymoon with Google SERP has ended in which case none of your blog/website content coming out in the first page or second or third page of Google for many keywords then you got Google Sandbox effect. You’ve been sandboxed by Google. And when it’s happen it’s hard to recover.
What’s Google Sandbox? Wikipedia says
The phenomenon that people have claimed to observe is that Google temporarily reduces the page rank of new domains, placing them into what is referred to as its “sandbox”, in an effort to counter the ways that search engine optimizers attempt to manipulate Google’s page ranking to bring sites to the top, by creating lots of inbound links to a new web site from other web sites that they own before creating that web site.
Google Sandbox


Hmm.. So that’s the SandBox means.. I think people using black hat SEO will drop into it
Thank you very much. it is helpful info about sandbox.