  In these lectures I give a pedagogical presentation of some of the recent
progress in supersymmetric Chern-Simons-matter theories, coming from the use of
localization and matrix model techniques. The goal is to provide a simple
derivation of the exact interpolating function for the free energy of ABJM
theory on the three-sphere, which implies in particular the N^{3/2} behavior at
strong coupling. I explain in detail part of the background needed to
understand this derivation, like holographic renormalization, localization of
path integrals, and large N techniques in matrix models
