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An SEO Audit is a complete analysis of website factors that are responsible for the website ranking on the SERP or we can say that website audit will give you a better understanding why your site is not performing on SERP. Google has adopted mobile first indexing policy so it is important to check whether the site is mobile friendly or not. Google considers page speed as one of the ranking factors so you should test your site loads fast enough. There are many reasons to get the SEO audit done.