Metastable states refer to states of matter or systems that are stable for a relatively long period of time, but are not in equilibrium and can eventually transition to a more stable state. These states exist as a result of a barrier to the transformation process, which prevents the system from reaching equilibrium quickly. Metastable states are commonly found in various physical, chemical, and biological systems, and the study of these states is important for understanding the dynamics of phase transitions, reaction kinetics, and the stability of materials. Researchers in this area investigate the factors that influence the formation and stability of metastable states, as well as the mechanisms by which they may transition to more stable states.