  Motivated by recent observations of compact binary gravitational wave events
reported by LIGO/Virgo/KAGRA, we review the basics of dark and hybrid stars and
examine their probabilities as mimickers for black holes and neutron stars.
This review aims to survey this exciting topic and offer the necessary tools
for the research study at the introductory level. Although called a review,
some results are newly derived, such as the equations of state for specific
dark star models and the scaling symmetry for the Tidal Love number.
