Multiplexing is a method in which several data sources share the same physical medium. Multiplexing is done by distributing some component of the transmission media.
TimeDivisionMultiplexing (TDM) shares the media by allocating portions in the time domain. Access to the physical medium is issued by allowing each source a timeslot of a certian length. Wireless protocols such as BlueTooth use TDM to effect reasonable communication between Piconet Masters and Slaves.