SEO is defined as Search Engine Optimization or and it is the continuous process of increasing the ranking of a website by deploying major keywords inside quality content to boost traffic to the website.
Whereas, SEM is defined as Search engine marketing and is a broader concept of increasing traffic to the websites in both ways’ SEO and PPC (Pay-per-click). The advertisers pay the search engines the money based on PPC rates set between them.
Generally, SEM is considered as paid marketing which takes money for boosting traffic to a particular website.
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Also, do watch our YouTube video from experts on SEO strategies.