Q: Please explain what ROI and ROS are respectively.
A: ROI (return on investment) is "the bottom line" on how successful an
ad or campaign was in terms of what the returns (generally sales
revenue) were for the money expended (invested).
Run-of-site: A run-of-site ad is one that is placed to rotate on all
non-featured ad spaces on a site.
CPM rates for run-of-site ads are usually less than for rates for
specially-placed ads or sponsorships.
(Source: http://www.whatis.com/adterms.htm)
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