How Google Indexes Your Site
I can't tell you how many times I've answered this question in forums, so I
figured since so many are asking, it would make for a great article.
First off, let's describe what we are talking about. A "bot" is a piece of
software from a search engine that is built to go through every page of your
site, categorize it, and place it into a database.
Google has three well known bots: The Adsense bot, the Freshbot and the
DeepCrawl.
The Adsense bot, as you could probably guess, is used for publishers who have
Adsense on their sites. As soon as a new page is created, the JavaScript within
the Adsense code sends a message to the Adsense bot, and it will come within 15
minutes to index the page so that it can serve up the most relevant ads.
But, for this conversation we are only concerned about the DeepCrawl and the
Freshbot.
The Freshbot crawls the most popular pages on your website. It doesn't matter if
that is one page or thousands. Sites like Amazon.com and CNN.com have pages that
are crawled every ten minutes, since Google has learned that those pages have
that amount of frequent changes. A typical site should expect to have a freshbot
visit every 1 to 14 days, depending on how popular those pages are.
What happens to your site on a Freshbot visit is that it finds all of the deeper
links in your site. It places those links into a database so that when the
DeepCrawl occurs, it has a reference.
Once a month, the DeepCrawl bot visits your site and goes over all the links
found by the Freshbot. This is the reason why it can take up to a month for your
entire site to be indexed in Google - even with the addition of a Google
Sitemap.
So, be patient and keep on adding content to your site, and work on getting
valuable in-bound links to your site - Google will reward you for it.
-To your online success!
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