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0 reviewsThe hierarchical model of galaxy formation predicts that the Milky Way halo is populated by tidal debrisms_overviewof dwarf galaxies and globular clusters. Due to long dynamical times, debris from the lowest mass objectsKeywords:remains coherent as thin and dynamically cold stellar streams for billions of years. The Gaia mission, providingastrometry and spectrophotometry for billions of stars, has brought three fundamental changes to our view ofMilky Waycold stellar streams in the Milky Way. First, more than a hundred stellar streams have been discovered andStellar haloStellar streamscharacterized using Gaia data. This is an order of magnitude increase in the number of well-measured streams,dark matterthanks to Gaia’s capacity for identifying comoving groups of stars among the field Milky Way population.AstrometrySecond, Gaia data have revealed that density variations both along and across stellar streams are common.SpectroscopyDark-matter subhalos, as well as baryonic structures were theoretically predicted to form such features, butobservational evidence for density variations was uncertain before Gaia. Third, stream kinematics are nowwidely available and have constrained the streams’ orbits and origins. Gaia has not only provided propermotions directly, but also enabled efficient spectroscopic follow-up of the proper-motion selected targets. Thesediscoveries have established stellar streams as a dense web of sensitive gravitational tracers in the Milky Wayhalo. We expect the coming decade to bring a full mapping of the Galactic population of stellar streams, aswell as develop numerical models that accurately explain their evolution within the Milky Way for a varietyof cosmological models. Perhaps most excitingly, the comparison between the two will be able to reveal thepresence of dark-matter subhalos below the threshold for galaxy formation (≲ 106 M⊙), and provide the moststringent test of