"It has been established that ultra-relativistic heavy-ion collisions produce a hot and dense QCD system which behaves like a perfect uid. Albeit, the system is not the theoretical predicted Quark Gluon Plasma, its study results important to understand the cosmic evolution of our Universe. As well as specic aspects of QCD in the non-perturbative sector. For three decades, minimum-bias proton-proton collisions were used as the baseline in order to extract the novel properties of the hot and dense systems. Surprisingly, the analysis of pp collisions as a function of the event multiplicity revealed new phenomena: collective-like behavior. For the heavy-ion community it is crucial to understand the origin of the similarities among the systems created in pp, p-A and A-A collisions."