SEM is the process of gaining traffic by purchasing ads on search engines. It is also called paid search and sometimes referred to as CPC (cost-per-click) or PPC (pay-per-click) marketing, because most search ads are sold on a CPC / PPC basis. SEM is short for “search engine marketing,” which once was used as an umbrella term to encompass both SEO (search engine optimization) and paid search activities. However, over time, many adopted the SEM acronym to refer solely to paid search. Here at Search Engine Land, we generally use SEM and/or paid search to refer to paid listings, with the longer term of search marketing used to encompass both SEO and SEM. Advice For Newbies New to paid search ads? Don’t worry! Search Engine Land has the perfect series for you: PPC Academy. This special column began in 2010 and provides a different installment each week to bring you up to speed on paid search. Another starting place is Google’s “Insider’s Guide To AdWords,” which you’ll f