Abstract: The increasing demand on unoccupied and unregulated spectral band resources will inevitably lead to the extension of wireless communication operation towards the higher terahertz (THz) frequency range. Higher carrier frequencies will allow for instantaneous transmission of huge amounts of data to satisfy the demand for high transmission rates.Alarge number of studies have indicated that, compared to optical fiber and microwave communications, THz communication has more advantages, such as high transmission rate, better directionality, high security, low scattering, and good penetrability. We review the progress in THz communication technology over the past few years, as well as possible future trends.