  The braneworld description of our universe entails a large extra dimension
and a fundamental scale of gravity that might be lower by several orders of
magnitude compared to the Planck scale. An interesting consequence of the
braneworld scenario is in the nature of spherically symmetric vacuum solutions
to the brane gravitational field equations which could represent black holes
with properties quite distinct compared to ordinary black holes in
4-dimensions. We discuss certain key features of some braneworld black hole
geometries. Such black holes are likely to have diverse cosmological and
astrophysical ramifications. The cosmological evolution of primordial
braneworld black holes is described highlighting their longevity due to
modified evaporation and effective accretion of radiation during the early
braneworld high energy era. Observational abundance of various evaporation
products of the black holes at different eras impose constraints on their
initial mass fraction. Surviving primordial black holes could be candidates of
dark matter present in galactic haloes. We discuss gravitational lensing by
braneworld black holes. Observables related to the relativistic images of
strong field gravitational lensing could in principle be used to distinguish
between different braneworld black hole metrics in future observations.
