Abstract: If the temperature is reduced, the fundamental properties of matter become more apparent. In some systems this « great simplification » creates a quantum fluid which can be in turbulent state, the main properties being superfluidity (the absence of viscosity) and the quantisation of the circulation. Examples of such quantum fluids are liquid helium, ultra-cold gases, polaritons (hybrid particles of light and matter) and the interior of neutron stars. The aim of this talk is to describe the main properties of this turbulent state (its dynamics and its topology) and compare it to ordinary turbulence.