What is the relationship between SEO and SEM?

SEO is a process to optimize your website and its content so that it ranks higher on search engines and your website gets free traffic from search engines like Google and Bing. SEO is free, but the content and website need time to rank on search engines.

SEM is a paid process to get traffic on your website. It includes display ads and PPC (pay-per-click) advertising that is purchased to get traffic from search engines.

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