Non-perturbative phenomena in non-Abelian gauge theories, such as quantum chromodynamics, are extremely elusive to analytical description. Prominent among these, features as the existence of a mass gap, magnetic monopole and gluino condensates formation, chiral symmetry breaking, and quark confinement are conjectured to take place at low energies. These kind of theories arise in String Theory when studying the dynamics of D-branes wrapped on certain cycles of special holonomy manifolds. The Maldacena correspondence thus provides a powerful framework that allows to face the study of this kind of phenomena by means of some dual supergravity description, the link being of a holographic nature. In this context, the study of M Theory in G₂ holonomy manifolds allows to learn about non-perturbative phenomena in non-Abelian gauge theories in terms of geometric aspects of these manifolds, their moduli spaces, singularities, and their possible geometric transitions ( ).