In the digital marketing world, many are still confused with understand the terms SEO and SEM. Search engine marketing is often used to describe a paid search. When the term SEM was introduced in the year 2001, it included both SEO and paid search advertising. But later the usage of SEM has slowly shifted and today SEM is about posting your ads in front of the search results and SEO is about ranking your websites based on keywords and other factors. One can’t say that SEM includes SEO as it depends on the person whom you talk to, but at a common understanding, SEM is considered as a paid search online marketing. To know more information, check out this website.