  Galaxy-scale outflows of gas, or galactic winds (GWs), driven by energy from
star formation are a pivotal mechanism for regulation of star formation in the
current model of galaxy evolution. Observations of this phenomenon have
proliferated through the wide application of old techniques on large samples of
galaxies, the development of new methods, and advances in telescopes and
instrumentation. I review the diverse portfolio of direct observations of
stellar GWs since 2010. Maturing measurements of the ionized and neutral gas
properties of nearby winds have been joined by exciting new probes of molecular
gas and dust. Low-$z$ techniques have been newly applied in large numbers at
high $z$. The explosion of optical and near-infrared 3D imaging spectroscopy
has revealed the complex, multiphase structure of nearby GWs. These
observations point to stellar GWs being a common feature of rapidly
star-forming galaxies throughout at least the second half of cosmic history,
and suggest that scaling relationships between outflow and galaxy properties
persist over this period. The simple model of a modest-velocity, biconical flow
of multiphase gas and dust perpendicular to galaxy disks continues to be a
robust descriptor of these flows.

Astrophysics of Galaxies