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Definition: A form of multiplexing where various data signals are assigned unique codes so they can occupy the same transmission channel at the same time. Primary use: Used in various radio communication technologies, including cellular networks like 3G and in GPS technology.

Definition: A type of digital multiplexing where a single data stream is divided into several parallel data streams, each of which modulates a separate carrier frequency that is orthogonal to one another. Primary use: Widely used in broadband internet communications, digital television, and audio broadcasting, such as in DAB, DVB, and WLANs.

Definition: A type of analog multiplexing where the total bandwidth available is divided into non-overlapping frequency bands, each carrying a separate signal. Primary use: Traditionally used in radio broadcasting, cable television, and telephone systems to transmit multiple signals simultaneously.

Definition: A multiplexing technique where several optical carrier signals are transmitted through a single optical fiber by varying the light wavelengths (colors). Primary use: Primarily used in fiber-optic communications to increase bandwidth over long distances.