RAID (Redundant Array of Independent Disks)
A standard for connecting multiple disks to the same server for higher security, speed and performance. Often used on web servers.

RDF (Resource Description Framework)
A framework for constructing languages for describing web resources.

Real Audio
A common multimedia audio format created by Real Networks.

Real Video
A common multimedia video format created by Real Networks.

Redirect
In web terms: The action when a web page automatically forwards (redirects) the user to another web page.

RGB (Red Green Blue)
The combination of the three primary colors that can represent a full color spectrum.