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For mobile search, and it looks like that index will become the dominant one. google-mobile3-colors-ss-1920-800x450 [Additional note] There are multiple interpretations regarding this mobile-first index, but the article on Kenichi Suzuki's overseas SEO information blog has the most detailed and accurate content, so please check it as well. I think. *In the article below, the expression "index division" is used as in the original text. Google plans to split its index for mobile in the coming months. From now on, this index will likely become the primary index used by search engines to answer queries. The desktop index is retained, but it is said to be less updated (not as up-to-date) as the mobile index. The news was announced today at Pubcon during a keynote by Google Webmaster Trends Analyst Gary Iljesh.
Gary didn't give a timeline for this, but when Search Engine Land later contacted him, he confirmed it could happen within "a few months." Google announced at SMX East last year that it was experimenting with the India Phone Number idea of a mobile index . Google has since decided that a mobile version of the index makes sense and has decided to move forward with the idea. There are actually many unknowns about how this mobile version of the index will work. For example, the mobile version of the index seems to be the "primary" index, but is it not used for desktop queries? Will the mobile version index only include “mobile friendly” content? How often is the desktop version index updated? Although desktop usage is a minority of Google's queries, it should still be significant.

The most important change is that by splitting the index for mobile, Google will be able to increase the index for "pure" mobile content (compared to the existing system, which pulls data from desktop content to determine mobile rankings). This would mean that ranking algorithms could be used in a different way (than existing systems). You can get a glimpse of the content by following the tweets of Gary's keynote participants, but that doesn't mean everything is clear.
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