Ultrafast magnetization dynamics is a research field investigating the behavior and evolution of magnetic ordering in materials on femtosecond and picosecond timescales. It focuses on phenomena initiated by ultrafast stimuli, typically intense laser pulses, that drive non-equilibrium processes involving the intricate interplay between spin, charge, and lattice degrees of freedom. This area seeks to elucidate fundamental mechanisms such as demagnetization, magnetization switching, and spin transport at extreme temporal resolution, holding significant implications for developing high-speed magnetic data storage and spintronic devices.