  This article reviews the recent developments in the theory of generalised
hydrodynamics (GHD) with emphasis on the repulsive one-dimensional Bose gas. We
discuss the implications of GHD on the mechanisms of thermalisation in
integrable quantum many-body systems as well as its ability to describe
far-from-equilibrium behaviour of integrable and near integrable systems in a
variety of quantum quench scenarios. We outline the experimental tests of GHD
in cold-atom gases and its benchmarks with other microscopic theoretical
approaches. Finally, we offer some perspectives on the future direction of the
development of GHD.
