| Rank | Where a listing appears in search results, relative to the first listing. For example, … |
| Re-inclusion request | A re-inclusion request is a request to a search engine to let sites or … |
| Recall | Related to precision, this is the degree in which a search engine returns all … |
| Reciprocal Link | A situation where two sites link to and from each other, though not necessarily … |
| Redirect | A tactic used to send a user to a different page from the one … |
| Registration | A request to be included in the database (index) of a search engine or … |
| Relevancy | The extent to which the searchers who find your page(s) are interested in what … |
| Results Page | The page(s) that display the results of a search. … |
| Return On Investment | Return on Investment associate with a particular marketing activity. The immediate return is usually … |
| Rich Internet Application | Rich Internet Applications are Web-based applications that function as traditional desktop applications however Web … |
| Robots file | A text file placed in a site's root directory, built with specific syntax, instructing … |
| ROI | Return on Investment associate with a particular marketing activity. The immediate return is usually … |