  In 2013, the IceCube Neutrino Observatory located at the geographic South
Pole detected evidence for a diffuse astrophysical neutrino flux above ~60 TeV.
To this day, IceCube has operated with full detector configuration for more
than 6 years. The observed astrophysical neutrino flux has been confirmed with
> 6$\sigma$ significance with both events starting within the detector (all
flavor) and events traversing through the Earth ($\nu_{\mu}$ charged-current).
Somewhat equal flavor ratio of astrophysical neutrinos is expected at Earth
assuming standard thorough oscillation. A search for tau neutrinos has been
carried out but yielded null result. No neutrino sources have been found to
contribute significantly to the diffuse flux at this point. In this paper, we
will review the current status of the astrophysical neutrino flux, discuss the
quest for neutrino point sources and overview the proposed design and physics
potentials of the future IceCube-Gen2.
