  One of the major developments in classical black hole thermodynamics is the
inclusion of vacuum energy in the form of thermodynamic pressure. Known as
Black Hole Chemistry, this subdiscipline has led to the realization that anti
de Sitter black holes exhibit a broad variety of phase transitions that are
essentially the same as those observed in chemical systems. Since the pressure
is given in terms of a negative cosmological constant (which parametrizes the
vacuum energy), the holographic interpretation of Black Hole Chemistry has
remained unclear. In the last few years there has been considerable progress in
developing an exact dictionary between the bulk laws of Black Hole Chemistry
and the laws of the dual Conformal Field Theory (CFT). Holographic Black Hole
Chemistry is now becoming an established subfield, with a full thermodynamic
bulk/boundary correspondence, and an emergent understanding of CFT phase
behaviour and its correspondence in the bulk. Here I review these developments,
highlighting key advances and briefly discussing future prospects for further
research.
