What technique involves dividing the available bandwidth into frequency bands for different communication channels?

The technique that involves dividing the available bandwidth into frequency bands for different communication channels is Frequency Division Multiplexing (FDM). FDM works by assigning distinct frequency ranges to multiple signals, allowing them to be transmitted simultaneously over a single communication medium without interference. Each channel's signal occupies a separate frequency band, ensuring that multiple transmissions can occur concurrently without overlapping, which is essential in telecommunications to make efficient use of available bandwidth.

This method is widely used in various applications, including radio broadcasting, television, and traditional telephony. By using FDM, multiple users can share a larger communication link without the need for multiple physical lines or paths, which enhances system efficiency and scalability.