The AdS/CFT correspondence is a special case of the holographic principle. It states that a quantum gravitating theory in Anti-de-Sitter (AdS) space is exactly equivalent to the gauge theory/Conformal Field Theory (CFT) on its boundary.
Use this tag for questions pertaining to the AdS/CFT correspondence, matrix models, etc.
It is also known as Maldacena Duality or Gauge-Gravity Duality. It is commonly applied in the context of string theory, and has given rise to various important results. Notable examples include:
BFSS Matrix theory, also known as M(atrix) theory.
Matrix Type IIA string theory.
Matrix Horava-Witten string theory.
Note, however, that all three of these were discovered before AdS/CFT was. Maldacena proposed AdS/CFT as a generalisation of these examples.