In this review talk we summarize the current state of this active subfield of cosmology. Non-Gaussianity is the study of higher-order correlation functions
which are generated during inflation and contain information about its underlying physics (at energy scales potentially as high as 10^14 GeV). It has been
recently understood that specific characteristics of these correlation functions have information about the masses and spins of the fields which were active
during inflation and contributed to the primordial fluctuations. These correlation functions are analogous to scattering cross-sections in collider
experiments, in that they contain information about the field spectrum at very high energies. From the observational side, the Planck satellite has put strong
constraints on the size of these effects, compatible with the predictions of generic single and multi field models. In the near future, galaxy surveys will
greatly improve this bound and start exploring the most physically interesting region.