Letter: R
Raster
Raster graphics are bitmap images, which means they're basically grids of individually defined pixels (as opposed to vector graphics, which produce images using mathematically generated points and lines). The dominant Web graphics formats, GIF and JPEG, are raster graphics. Raster is often used with complex images, such as photographs
RDF
The resource description framework (RDF) is a specification being developed by the World Wide Web Consortium (W3C) to create a cross-platform standard for managing meta information. Metadata, or data about data, has many uses, including cataloging websites, creating intelligent agents, automating sitemapping, and managing digital signatures of intellectual property. RDF is designed to provide an infrastructure to support metadata across many Web-based activities. RDF will use the eXtensible markup language (XML) so that all other tools being built around XML will be able to provide a uniform and interoperable exchange across the Web.
Reach
Reach is the number of different types of individuals that see an ad or message. Reach also applies to how well-known particular sites or groups of sites are. Web research and reporting companies like RelevantKnowledge issue monthly reports on the 25 sites with the greatest overall reach, as well as more detailed reports on demographic characteristics by site.
Referral Network
Think of the food court at the mall. Most of the time, mallsters will go there looking for food in general, then decide what to eat after they've checked out the selection. The eaters benefit because they don't have to wander all over the mall looking for lunch, and the feeders benefit from the added exposure. A referral network works in the same way. The Web is perfect for this kind of marketing, since sites with similar audiences can be grouped just by linking them together. Amazon.com has an incredibly successful network of thousands of mini-bookstores. The small bookstores get more customers, and Amazon gets money for the books they sell to the little guys - a perfect symbiotic relationship.
referrer
(or referring page) URL of an HTML page that refers visitors to another web site.
Referrer
URL of an HTML page that refers to the site.
Relationship Marketing
This vaguely oxymoronic term refers to the process of finding out who your visitors are and what they want, then tailoring your site content to meet those specific needs. Whether you've got a simple homepage or a heavy duty e-commerce site, relationship marketing can help you create the kind of bond with your users that'll keep the competition drooling.
relevance feedback
Documents retrieved in a search that are used to further refine the search.
Render
To render a graphic means to draw a real-world object as it actually appears. There are two widely used rendering processes: ray tracing and scanline rendering. Scanline rendering creates images one vertical line at a time, while ray tracing renders object-by-object. In general, ray tracing produces better results, but scanline rendering is useful in animation, where the image quality of each individual frame isn't as important as the finished product.
Resolution
The resolution of an image describes how fine the dots are that make up that image. The more dots, the higher the resolution. A 300 dpi (dots per inch) printer is capable of printing 300 dots in a line 1 inch long. This means it can print 90,000 dots per square inch. When displayed on a monitor, the dots are called pixels. A 640-by-480-pixel screen is capable of displaying 640 distinct dots on each of its 480 lines, or about 300,000 pixels.
Retention
Retention refers a company's desire to keep you as a customer by any (cost-effective) means necessary.
Return Code
The return status of the request which specifies whether the transfer was successful and why.
Possible "Success" codes are:
200 = Success: OK
201 = Success: Created
202 = Success: Accepted
203 = Success: Partial Information
204 = Success: No Response
300 = Success: Redirected
301 = Success: Moved
302 = Success: Found
303 = Success: New Method
304 = Success: Not Modified
Possible "Failed" codes are:
400 = Failed: Bad Request
401 = Failed: Unauthorized
402 = Failed: Payment Required
403 = Failed: Forbidden
404 = Failed: Not Found
500 = Failed: Internal Error
501 = Failed: Not Implemented
502 = Failed: Overloaded Temporarily
503 = Failed: Gateway Timeout
RFC
(Request For Comments) -- The name of the result and the process for creating a standard on the Internet. New standards are proposed and published on line, as a Request For Comments. The Internet Engineering Task Force is a consensus-building body that facilitates discussion, and eventually a new standard is established, but the reference number/name for the standard retains the acronym RFC, e.g. the official standard for e-mail is RFC 822.
RFC
(Request for Comments) The documents that contain the standards and other information for the TCP/IP protocols and the Internet in general. They can be found at several sites through anonymous FTP.
RGB
The red, green, and blue (RGB) color system can represent a large portion of the color spectrum by mixing these three primary colors. Since cathode ray tube devices, such as computer monitors, display color with red, green, and blue light, this is the color system of the Web. There are 216 RGB colors that appear without dithering (i.e., without varying the pattern of dots in an image) in browsers for the PC and Macintosh platforms
Rollover
Rollover is a widely used dHTML effect, its name originally coming from Macromedia Director's scripting language, Lingo. Internet Explorer 4.0 first supported rollover effects through Cascading Stylesheets (CSS) without requiring extra code. The dHTML mouseover works by switching the visibility of a CSS layer from hidden to visible and back again. This kind of rollover allows you to swap in text or plug-ins, as well as alternate back and forth between images to create the effect. The 4.0 implementation of CSS and JavaScript is not consistent, however, so the code can get ugly.
Router
A router (not to be confused with a bridge) is a data network device that transfers data from one LAN to another. Routers can be hardware- or software-based, though larger applications and faster communication speeds all but require a hardware router. Routers are used in homes and offices with high-speed Internet access such as DSL; they serve to connect the local LAN to the high-speed WAN operated by a service provider.
Router
A special-purpose computer (or software package) that handles the connection between 2 or more networks. Routers spend all their time looking at the destination addresses of the packets passing through them and deciding which route to send them on.
routing
The process of locating the most efficient or effective pathway through a network to a destination computer. Routing is commonly handled by the network or communication software.
RSA
(Rivest, Shamir, Adleman Public Key Encryption) A patented public key (also called dual-key or asymmetric) data encryption scheme that can provide both encryption and authentication.
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