Abstract:  Cosmic Dawn and the Epoch of Reionization (EoR) are some of the least explored stages of cosmic history. The faint 21-cm signal of hydrogen atoms in the intergalactic medium provides a unique way to probe these epochs by constraining the thermal and ionization history of the Universe. Once this signal is robustly measured, it will inform us about the early populations of stars, galaxies and black holes. In my talk I will discuss the recent advances in the field of observational and theoretical 21-cm cosmology.