A dispersion is a system in which particles of one phase are dispersed throughout a medium that is in a different phase. Therefore a dispersion is a two-phased system. It is composed of a dispersion medium and a dispersed phase. Dispersion medium is a continuous medium in which the dispersed phase is distributed throughout. Dispersed phase is the phase that is composed of particles that are distributed through another phase. The main difference between dispersed phase and dispersed medium is that dispersed phase is a discontinuous phase whereas dispersion medium is a continuous phase.