RAID5
RAID is a way of storing the same data in different places by placing data on multiple hard disks. By placing data on multiple disks operations can overlap in a balanced way, improving performance.

RAM - Random-Access Memory
Hardware inside your computer that retains memory on a short-term basis. This information is stored temporarily while you're working on it. RAM comes in several different forms:

- DRAM - Dynamic Random-Access Memory A memory chip contained on such devices as video and sound cards. DRAM is "dynamic" because the chip contains an electrical charge (as opposed to SRAM, see below). The electrical charge will die out eventually so it must refresh its memory regularly, which it does automatically from your CPU. The only reason you need to know about DRAM is because it is related to access time and video cards, etc.

- SRAM - Static Random-Access Memory SRAM is used for caching because it is a lot faster. This chip holds its contents without refreshing from the CPU.

RealAudio
RealNetworks' (formerly Progressive Networks) RealAudio client-server software system enables Internet and online users equipped with conventional multimedia personal computers and voice-grade telephone lines to browse, select and play back audio or audio-based multimedia content on demand, in real time. This is a real breakthrough compared to typical download times encountered with delivery of audio over conventional online methods with which audio is downloaded at a rate that is five times longer than the actual program.

RealMedia
A term encompassing RealNetworks' RealAudio and RealVideo.

RealVideo
A streaming technology developed by RealNetworks (formerly Progressive Networks) for transmitting live video over the Internet. RealVideo uses a variety of data compression techniques and works with both normal IP connections as well as IP Multicast connections.

Remember My Login
If you select this option you will not be prompted for your username and password when entering the site. This maynot be secure if you are using a public or shared computer. Your computer must be set to accept cookies to use this feature.

Remote Terminal
It is possible to log in to a remote computer by using an application program based on TELNET - a terminal emulation protocol made for this purpose. The user can therefore enter commands on a keyboard attached to their local computer and access files, etc., on a remote computer that may be located anywhere in the world.

Router
Hardware (or software) that connects a local network to the Internet. Routers look at the destination addresses of the packets passing through them and decide which route to send them on.