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

Search Engine Optimization:

(Excerpt from Wikipedia): Search engine optimization is available as a stand-alone service or as a part of a larger marketing campaign. Because SEO often requires making changes to the source code of a site, it is often most effective when incorporated into the initial development and design of a site, leading to the use of the term "Search Engine Friendly" to describe designs, menus, Content management systems and shopping carts that can be optimized easily and effectively.

A range of strategies and techniques are employed in SEO, including changes to a site's code (referred to as "on page factors") and getting links from other sites (referred to as "off page factors").

Read full Search Engine Optimization Wikipedia here

Search Engine Marketing:

(Excerpt from Wikipedia): In Internet marketing, search engine marketing, or SEM, is a set of marketing methods to increase the visibility of a website in search engine results pages (SERPs). The three main methods of SEM are:

• Search engine optimization attempts to improve rankings for relevant keywords in search results by improving a web site's structure and content


• Pay per click advertising uses sponsored search engine listings to drive traffic to a web site. The advertiser bids for search terms, and the search engine ranks ads based on a competitive auction as well as other factors.


• Paid inclusion can provide a guarantee that the website is included in the search engine's natural listings. However, as of 2006 the leading search engine, Google, does not offer this service.

Read full Search Engine Marketing Wikipedia here

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