ROI stands for Return On Investment, or basically the profits or losses received from an online advertising campaign.

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PPC stands for Pay-Per-Click - when a company or advertiser pays a search engine or affiliate for each click-through generated by a user.

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Keyword density is the percentage of keywords contained within the total number of indexable words within a web page, or to put it another way, the ratio of a keyword or key phrases to the total number of words on that page. If the keyword density i

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