SEO Website Services's Articles - How Search Engines Work:
Search Engines such as google crawl the web daily and make minor changes to positions and listings, however, once a month there's
a google dance, this is when the entire index on google gets updated to maintain up-to-date listings. The google dance can take up to
a few days, and if you catch it at the right time you'll notice the changing positions on each listing. It's very important to
update your content and keywords monthly because of situations such as this. A website with every varying content and keywords will remain
above a site with static content each month.
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