Speaker: Dr. Arnab Kundu, Theory Division, Saha Institute of Nuclear Physics, Kolkata.  Abstract: In this talk, we will begin by introducing the idea of Gauge-String duality, sometimes also known as the Gauge-Gravity duality. We will then discuss how this duality can be used to address questions in Quantum Field Theories, in general, at strong coupling and at non-vanishing density. Finite density systems display rich, varied and often poorly understood physics. We will subsequently discuss some recent progress in understanding the nature of the ground state of a strongly coupled, finite density system, with fundamental matter field. We will work in the so-called Veneziano limit, in which both the number of colours and flavours are taken to be large, and discuss the gravity dual geometries.