Re-Indexing or What is a Google Dance?
What is a Google Dance?: "Google Dance is the resulting changes in search engine results after...
Index Update
When new indexing data is pushed out to data centers.
Other search engine jargon you might want to learn straight from the official Google blogger himself includes:
Algorithm update
Typically yields changes in the search results on the larger end of the spectrum. Algorithms can change at any time, but noticeable changes tend to be less frequent.
Data refresh
When data is refreshed within an existing algorithm. Changes are typically toward the less-impactful end of the spectrum, and are often so small that people don’t even notice. Index update is one of these data refreshes."
So How often does Google do and Index Update?
According to Google: "Crawls are based on many factors such as PageRank, links to a page, and crawling constraints such as the number of parameters in a URL. Any number of factors can affect the crawl frequency of individual sites.
Our crawl process is algorithmic; computer programs determine which sites to crawl, how often, and how many pages to fetch from each site."
And they go on to say that they don't accept payment for initiating crawls.
But they do offer plenty of free tools at Google Webmaster Central.
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