SEM and SEO
Search Engine Marketing (SEM) and Search Engine Optimization (SEO) are often confused for one another. Indeed the terms are sometimes mistakenly used interchangeably. Put simply, SEM is a paid tactic and involves bidding on keywords to appear at the top of the Search Engine Result Pages (SERP) and paying each time a user clicks on the ad. In contrast, SEO involves proving the relevance of your website for certain key terms and phrases so that when people search the terms, a link to your website will appear without paying to be placed on the SERP.