  String theory provides one of the most deepest insights into quantum gravity.
Its single most central and profound result is the gauge/gravity duality, i.e.
the emergence of gravity from gauge theory. The two examples of M(atrix)-theory
and the AdS/CFT correspondence, together with the fundamental phenomena of
quantum entanglement, are of paramount importance to many fundamental problems
including the physics of black holes (in particular to the information loss
paradox), the emergence of spacetime geometry and to the problem of the
reconciliation of general relativity and quantum mechanics. In this article an
account of the AdS/CFT correspondence and the role of quantum entanglement in
the emergence of spacetime geometry using strictly the language of quantum
field theory is put forward.
