Search Engine Marketing (SEM) describes the process of marketing or promoting a website in search engines - typically via Search Engine OPtimisation (SEO), buying pay per click ads, and paid inclusion.
Search engine optimisation is the art and science of publishing information and marketing it in a manner that helps search engines understand your information is relevant to relevant search queries.
Pay Per Click is a pricing model which most search ads and many contextual ad programs are sold through. PPC prograns are offered by all major search enginbs (Google Adwords, Yahoo Search Marketing, Microsoft adCenter).
Paid Inclusion is a method of allowing websites which pass editorial quality guidelines to buy relevant exposure.
Directories such as the Yahoo! Directory and Business.com allow websites to be listed for a flat yearly cost.
Yahoo! Search allows webmasters to pay for inclusion for a flat review fee and a category based cost per click.
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