Rank -- How well a particular web page or web site is listed in a search engine results. For example, a web page about apples may be listed in response to a query for "apples." However, "rank" indicates where exactly it was listed -- be it on the first page of results, the second page or perhaps the 200th page. Alternatively, it might also be said to be ranked first among all results, or 12th, or 111th. Overall, saying a page is "listed" only means that it can be found within a search engine in response to a query, not that it necessarily ranks well for that query. Also called position.
RAM -- Random Access Memory
RBSE -- Repository Based Software Engineering Program
RDBMS -- Relational Database Management System
RDF -- Resource Description Framework
Reciprocal Link -- A link exchange between two sites.
Referrer -- The URL of the Web page from which a visitor came, as indicated by a server's referrer log file. If a visitor comes directly from a search engine listing, the query used to find the page will usually be encoded in the referrer URL, making it possible to see which keywords are bringing in visitors.
Registration -- See Submission.
Relevance -- A subjective measure of how well a document satisfies the user's information need. Ideally, your search tool should retrieve all of the documents relevant to your search. However, this is subjective and difficult to quantify.
Relevancy Algorithm -- The method used by search engines and directories to match the keywords in a query with the content of all the Web pages in their database so the Web pages found can be suitably ranked in the query results. Each search engine and directory uses a different algorithm and frequently changes this formula to improve relevancy.
Relevancy -- The degree to which a document or Web page provides the information the user is looking for, in terms of user needs.
Re-submission -- Repeating the search engine registration process one or more times for the same page or Website. This is regarded with suspicion by search engines because it can be indicative of spamming techniques. Some search engines will de-list sites for repeated re-submission. Others limit the number of submissions of the same page in a 24 hour period. Occasional re-submission of changed pages is usually not a problem.
Results Page -- After a user enters a search query, the page that is displayed, is call the results page. Sometimes it may be called SERPs, for "search engine results page."
RFC -- Request for Comments
RFI -- Request for Information
RFP -- Request for Proposal
RFQ -- Request for Quotation
RGB -- Red - Green - Blue
RO -- Romanian (2 Letter Language Code)
ROAD -- Return On Advertising Dollar
ROAS -- Return On Advertising Spend
Robots.txt -- Robots.txt is a file which well behaved spiders read to determine which parts of a website they may visit.
ROI -- Return On Investment. Refers to the percentage of profit or revenue generated from a specific activity. For example, one might measure the ROI of a paid listing campaign by adding up the total amount spent on the campaign (say $200) versus the amount generated from it in revenue (say $1,000). The ROI would then be 500 percent.
ROM -- Read Only Memory
RSS -- Rich Site Summary
RTF -- Rich Text Format (file.rtf)
RU -- Russian (2 Letter Language Code)
RUR -- Russia Rubles (3 Letter Currency Code) of Keys
