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Relevancy Ranking
A measure of how useful searchers find search results.

ROI – Return on Investment
A performance measure used to evaluate the efficiency of an investment or to compare the efficiency of a number of different investments.

RSS – Rich Site Summary
For syndication or sharing of content, for news items and blogs. For example, it allows for a section of a website to extract the latest headlines from another website.

RTSP – Real time streaming protocol
Internet standard for the exchange of streams of audio and video data.