Inversely, a large reduction in traffic is also taken into account. Simply put, a large loss in traffic equals a loss of credibility and a loss of relevance.
Reflecting the popularity of your site, advertisers (the number and quality of ads) on your page also seem to affect relevance.
Finally, the number of times a page is selected from SERPs (Search Engine Results Page), the amount of time browsers spend on a page, the time between trips to Google, and measured usage of the Back button may all play a role in determining page rank and relevance.
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known as SEO or SEM
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