Search Engine Marketing

What is Search Engine Marketing? What's the difference between Search Engine Marketing (SEM) and Search Engine Optimization (SEO)?

Search engine marketing encompasses all types of Internet marketing, while Search Engine Optimization (SEO) focusses on making changes to a website in an effort to rank well in organic search results.

In actuality, SEO is a part of SEM. SEM is a broader term while SEO is a set of strategies that help in improving the page rank and ranking of your website in SERPs.
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SEO can be viewed as a collection of techniques, strategies, tools to increase online visibility of a site and bring in more traffic. All efforts to increase online visibility are subsumed under SEM, so SEO is under SEM.

Search engine marketing or SEM, refers mainly to the text advertisements which appear at the top or on the right hand side of search engine results pages. These advertising links are purchased mainly from Google (Adwords) and Yahoo (Overture).

Search engine optimization or SEO refers to improving a web sites' natural and organic ranking in the search engine results page. This more affordable method is often slow and new web sites may take up to a year to achieve decent rankings in Google. The methods of achieving high rankings are based on 2 main components, which are On-page optimization and Off-page optimization

SEM holds the advantage in the fact that you can get instant qualified traffic to your web page. How much traffic is only dependent on your budget.

SEO on the other hand is a longer term approach, and utilizes many best practice web design standards. Good original content, well implemented on page optimization and a solid link building campaign is usually more than sufficient for SEO.

Search Engine Optimization is a technics of a improving your web site or improve your page rank in google, and also Search engine marketing is a part of seo and empliment all the technics for seo then automatically included SEM in this technics.

From webopedia:

Short for search engine marketing, SEM is often used to describe acts associated with researching, submitting and positioning a Web site within search engines to achieve maximum exposure of your Web site. SEM includes things such as search engine optimization, paid listings and other search-engine related services and functions that will increase exposure and traffic to your Web site.

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