The exact parameters which Google employs to index the all the worlds information on the web is a complete anathema to some business webmasters.
While it's certainly true that there's a lot of science and math behind Google algorithms all you actually need is to understand are the core basics in order to make well judged business decisions regarding Google and your website.
The first thing to know is that Google performs 2 main kinds of crawls. A 'deep crawl' is where every page of your website is explored and indexed and this is kind of crawl through the net is performed about once a month. Because it takes so long to complete Google cannot rely alone on this kind of indexing, the internet is simply changing too fast and Google would quickly find itself out of date.
Performing a deep crawl takes up to one week for Google to complete but of course it must index all of that information which takes longer again. By the time the full process is complete it can take 6 weeks or more for a new site to be found and indexed if it's lucky!
Due to this fact Google also performs a fresh crawl. Instead of indexing sites deeply it just grazes the surface of the web gathering latest updates and accessing home pages.
These fresh crawls are automated robots which follow links from site to site and are running more frequently than deep crawls, in many ways they are responsible for keeping Google current with what's on the web.
For this reason it's widely known that you are much more likely to get indexed by Google by having some new backlinks to your site than by simply submitting your URL and relying on Google's deep crawl to find you.
Realistically it could take months for a new site and domain appear on Google's database, something which could be achieve in a single day with backlinks. The exact frequency of fresh crawls are secret however by staying alert it is possible to notice when they have occurred.
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