Say if I register a domain and have developed it into a complete website. From where and how Googlebot knows that the new domain is up? Does it always start with the domain registry?
If it starts with the registry, does that mean that anyone can have complete access to the registry’s database? Thanks for any insight.
Google will find your website on its own if some existing website has a link to it.
You can jump-start the process: http://www.google.com/addurl/.
You may also be interested in Google’s Webmaster Tools.