Search Engine Optimization (SEO): Maximizes search result exposure by targeting and driving Web traffic and ultimately delivering increased sales. The majority of search engine page results come from unpaid or organic search. SEO optimizes websites to ensure top search engine placement, such as Google, as only 15 percent of searchers continue beyond page one.
Search Engine Marketing or SEM encompasses the steps taken to increase relevant traffic to your website, through higher rankings on search engines. Traditional SEM is made up of two processes: “organic” search engine optimization (SEO) and pay-per-click advertising (PPC) (or cost-per-click (CPC)). However, the field of SEM is a changing and expanding field thanks to constant new developments, such as:

SEO is not an appropriate strategy for every website, and other Internet marketing strategies can be more effective like paid advertising through pay per click (PPC) campaigns, depending on the site operator's goals. Search engine marketing (SEM), is practice of designing, running, and optimizing search engine ad campaigns.[55] Its difference from SEO is most simply depicted as the difference between paid and unpaid priority ranking in search results. Its purpose regards prominence more so than relevance; website developers should regard SEM with the utmost importance with consideration to PageRank visibility as most navigate to the primary listings of their search.[56] A successful Internet marketing campaign may also depend upon building high quality web pages to engage and persuade, setting up analytics programs to enable site owners to measure results, and improving a site's conversion rate.[57] In November 2015, Google released a full 160 page version of its Search Quality Rating Guidelines to the public,[58] which now shows a shift in their focus towards "usefulness" and mobile search. In recent years the mobile market has exploded, overtaking the use of desktops as shown in by StatCounter in October 2016 where they analysed 2.5 million websites and 51.3% of the pages were loaded by a mobile device [59]. Google has been one of the companies that have utilised the popularity of mobile usage by encouraging websites to use their Google Search Console, the Mobile-Friendly Test, which allows companies to measure up their website to the search engine results and how user-friendly it is.
In some contexts, the term SEM is used exclusively to mean pay per click advertising,[2] particularly in the commercial advertising and marketing communities which have a vested interest in this narrow definition. Such usage excludes the wider search marketing community that is engaged in other forms of SEM such as search engine optimization and search retargeting.
I feel we can also focus a lot on the kind of keywords we target. I had a client who was in a very competitive market place, we optimized their site for some really targeted, long tailed keywords which didn’t have very high search volume, so the traffic didn’t really go up drastically but the amount of conversions & the kind of CTRs the site received was incredible.
At our agency, we work with sites of varying sizes, from very large to quite small, and recently, we have noticed a trend at the enterprise level. These sites aren’t relying as much on Google for traffic any more. Not only are they not relying on Google traffic, but also, the sites are getting less than 10 percent (or slightly more) of their organic traffic from the search giant.
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