Black holes are solutions to Einstein General Relativity (GR) which can form

dynamically under gravitational collapse. Existence of black holes have also been

confirmed by astrophysical observations. Black holes, once semi-classical physics is

also added, undergo Hawking radiation and hence may eventually evaporate. This

leads to "information paradox" which may be remedied through "black hole

complementarity", a manifestation of equivalence principle at quantum level.

Nonetheless, recently black hole complementarity itself has been put into scrutiny

and question through the "firewall" catastrophe. We discuss these issues and some

of the proposals and issues about black holes, their description as thermodynamical

systems.