A method of spread spectrum radiocommunications. It uses several different frequencies in a psuedorandom order, and "hops" between them. Generally the transceiver won't dwell on a given frequency for more than 50milliseconds, but sometimes shorter or longer dwell times are used.
This method of spread spectrum communications provides a very secure, generally hard to interfere with, and most often high datarate method of communicating without wires. It is all of these things because, the order of, number of, and frequency of hops is pseudorandom, generally negotiated by the transceivers before data transmission begins and also during communication. This ensures that interference on any given frequency cannot disrupt the entire (or for that matter, a meaningful percentage of the) transmission/reception; the pseudorandom frequencies and hops also make it nearly impossible to be listened in upon without prior knowledge of said sequence (hence secure). see also: direct sequence.

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