Holography, which reveals a specific correspondence between gravitational and quantum theories, is an ongoing area of research that has known a lot of interest these past decades. The duality of holography has many applications: it provides an interpretation for black hole entropy in terms of microstates, it helps our understanding of solid state properties such as superconductivity and strongly coupled quantum systems, and it even offers insight into the mysterious realm of quantum gravity. 

In this talk, I will first introduce the concept of holography and some of its applications. I will then discuss some notions of string theory and geometry that are commonly used in holography. Finally, if time permits, I will present some of our latest results, where we match the energy of membranes in supergravity to properties of the dual quantum models.