Frequency Division Multiplexing (FDM)
In FDM the frequency spectrum is divided to form logical channels with each user having exclusive possession of the assigned channel.
Time Division Multiplexing (TDM)
In TDM, the users take turns (in a round robin); each one is periodically getting the entire bandwidth for the allotted time.
Television broadcasting provides an example of multiplexing. Each TV channel operates in a different frequency range, which is a portion of the allocated spectrum, with the inter-channel separation great enough to prevent interference. This system is an example of FDM. During the transmission of any program (Serial/film), there is an advertisement as well. These two alternate in time on the same frequency. This is an example of TDM.
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