A Duality Web in 2 $+$ 1 Dimensions and the Unity of Physics \newline

A combination of ideas originating from Condensed Matter physics, Supersymmetric Field Theory, and AdS/CFT has led to a detailed web of conjectured dualities.~ These relate the long distance behavior of different short distance theories.~ These dualities clarify a large number of confusing and controversial issues in Condensed Matter physics and in the study of 2$+$1 dimensional quantum field theory.