Before explaining the fact, we have to understand what SEO and SEM meant for.
SEO is a bunch of un-paid activities carried out to improve the visibility of your websites in web search engines and in SERP Pages as it is the process of improving value and volume of preferred traffic towards the website from search results of various search engines for targeted key phrases or keywords.
SEM on the other hand involves the sum of paid as well as unpaid Search Engine based/related Online Marketing and Advertising activities as its motto is increasing the web traffic, increasing conversions and taking online actions that leads to a purchase of the product/service.
Social Media Marketing - Its recognized as a higher level of SEM.
Paid Inclusions/Paid Link Submissions
Geo Targeting - You can as well apply Geo Targeting in your SEM activities even though it falls under SEO.
Email Marketing - Most of the people think that it is not a SEM Activity. But actually it is. It is a SEM method that involves the sending out of properly worded marketing mails.
Blog Marketing - Based on the concept it will also falls under the SEM activities.
SEM involves much more and I am also not remindful about its activities as a whole. SEO and SEM are both a Ocean in the Online Marketing World and We are just learning a part of it.
SEO Jobs - Recent Vacancies