First, let us look at how I would determine both terms:
SEO (Search Motor Optimization)
The use of various methods to enhance a web website's organic position on google to be able to entice more guests.
SEM (Search Motor Marketing)
The procedure of promotion a web page using google either through enhancing organic positions or spending for mouse clicks or both.
Therefore, when someone says �we do both SEO and SEM�, he actually indicates �we do (organic look for marketing) and (organic + pay per just click look for marketing)�. Still, this sounds all right, except that when you discuss SEM, it�s is enough to protect both organic and pay per just click online look for engine promotion.
Search Motor Marketing should be the mother or father classification whose subsets consist of both SEO and Pay Per Click and should not relate only to the latter.
Why do I discuss this? It�s because the use of these shortened forms without effectively knowing their significance places a deceiving idea of what do each of these conditions really mean. When Danny Sullivan described this, I completely believe the fact with his ideas. Perhaps we can fault Yahoo! partially because when Overture was then relabeled Yahoo! Search Marketing, individuals believed that online look for engine promotion was all about compensated look for, something that Yahoo! Search Marketing was all about.
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