What is the difference between SEO and SEM?

The difference between SEO and SEM is simply that Search Engine Optimization is part of Search engine marketing or Search marketing as it is widely known. Both processes aim at increasing visibility in search engines. … It involves other methods that can get you more search engine visitors like PPC advertising.

SEM - Text on Blue Puzzles.

 Search engine marketing (SEM) used to refer to both organic and paid methods of increasing your website’s rank on search engines. It is now more commonly associated with the latter and has come to be synonymous with several other terms, including pay-per-click (PPC), cost-per-click (CPC), paid search, and AdWords (which is specific to advertising on Google). No matter what you call it, running an SEM campaign can make a huge difference in the online visibility and growth of your business.