Search engine optimization is dedicated to webpage optimization for organic ranking that includes on-page optimization and off-page promotion. SEO strategy doesn’t have any paid promotion plan.  However, SEM is the term that indicates paid promotion. Search engine marketing majorly refers to PPC, page boosting, content paid promotion. If you want just organic ranking then SEO optimization should be your companion. Though, if you want more business you must opt for SEM marketing with the help of best organic SEO agency marketers in Australia and India.