 lahorei wrote:
what do u mean by crawl??????????? |
The short version is that it starts with your home page and works through all links to places within your site. Google does two types of crawls... the one I just wrote about, and a "deep" crawl that explores all links on all pages in your site to other pages within the site as well as dynamically generated pages. IIRC, it also goes down to lower levels on your site tree, and explores each directory it finds for pages that don't have links to other pages.
The initial crawl is done within a week or two. The deep crawl is usually around every six weeks, bit has been known to take three months before they get to it.
About every 6 weeks or so, Google "Dances". The dance is when they re-calculate all the site ratings based upon their mysterious formulas. Usually they tweak the formula a little each time. This past summer, they went for several months between "dances".
In mid-November of this year, Google did a Dance referred to as "Florida". It severely changed the ranking of a great number of sites - for better or worse.
Google has about a dozen "servers" world wide (really disk farms and processor clusters). They pull a server during a dance, apply their changes and tweaks to it, beta test it for a while,and put it back in place while they go to the next one. As a result, depending upon which server you use for a Google, you may get different search results.
It can take 3-6 months for a new site to be fully indexed. Google will punish sites who try to deceive it - lower rankings or being removed from the listings. Their intention is to turn up the most relevant listings for their searchers. Your best bet for a high ranking is to target specific search phrases and put good content on your site that's appropriate for those phrases.
Flash home pages are poor for search engines. any links from them to within the site are embedded within the flash and Google can't read them as text. To see how Google "Sees" your pages, download the text-only browser Lynx.
Framed sites are also bad. The home page is actually the frame set page, not the content of the pages within the frame set page. When Google does index the site, it will provide links directly to individual pages that are usually displayed in the frame set, bit it won't know they are supposed to be displayed that way. People who follow those Google links will not see your site navigation.
What I've written here is a layman's explanation of how Google does it's thing, but Google is always in transition - what works now may not work after the next dance. Optimizing your site for search engines is not an event, it's a process.
The newsgroup alt.internet.search-engines is a good resource. There are many forums on the net devoted to Search Engine Optimization (SEO). A Google for them will turn up more accurate and detailed information than I've provided.
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