Google needs Caffeine

This is a really interesting evolution. Google has updated his world renowned algorithm to a new version code named “Caffeine”. While the old index generated by the algorithm “had several layers, some of which were refreshed at a faster rate than others; the main layer would update every couple of weeks. To refresh a layer of the old index, we would analyze the entire web, which meant there was a significant delay between when we found a page and made it available to you.
With Caffeine, we analyze the web in small portions and update our search index on a continuous basis, globally. As we find new pages, or new information on existing pages, we can add these straight to the index. That means you can find fresher information than ever before—no matter when or where it was published”.
You can read about it and know more by pointing to the original googleblogpost here

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