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| Reach | | Sometimes expressed as the percentage of the universe of a ... |
| Reciprocal Link | | The practice of placing a link from website A to ... |
| Reciprocal linking | | the practice of trading links between websites.
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| Redirect | | where the Internet user is automatically taken to another web ... |
| Referral Fees | | Fees paid in exchange for delivering a qualified sales lead ... |
| Referrer | | a web page, containing a link to your web page, ... |
| Relevance | | the likelihood that a given web page will be of ... |
| Remnant Inventory | | Low-cost advertising space that is relatively undesirable or otherwise unsold. ... |
| Render | | format and stylize HTML source code into the final format ... |
| Repeat Visitor | | A repeat visitor is a single individual or browser who ... |
| Replica | | a copy of a dynamic web site or a group ... |
| Resubmitting | | submitting your web page address(es) to search engines after you've ... |
| Results | | can refer to SERPs ... |
| Rewrite | | as in "URL rewriting" ... |
| Robot | | see "spider" ... |
| Robots.txt | | Text file placed in a websites root directory and linked ... |
| ROI - Return On Investment | | The benefit gained in return for the cost of investing ... |
| RSS Feeds | | An acronym for Rich Site Summary or Rich Site Syndication. ... |
| Run of Site (ROS) | | The scheduling of ads across an entire site, often at ... |
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