CDMA
Code Division Multiple Access, a third generation digital wireless technology. CDMA allows multiple users/transmitters to use the same channel at the same time without (or with minimal) interference.
Clustering
Connecting many computers together so that they appear (for many purposes) as a single machine. Clustering computers together in this way is normally done to provide greater reliability and performance
Compression
To reduce in size. The amount of storage space required to store data can be reduced if the data is compressed. Compression can be achieved either without loss of information (called "lossless") or may result in some loss of information (called "lossy").
Firewall
A program (or set of programs and/or hardware) that prevents unauthorised access to a network or to an individual computer.