Rydberg states are highly excited electronic states of atoms or molecules that are characterized by a large principal quantum number. These states have a unique set of properties, such as long lifetimes, large dipole moments, and sensitivity to external electric and magnetic fields. Rydberg states have applications in a variety of fields, including quantum information processing, precision spectroscopy, and ultracold atomic physics. Researchers study Rydberg states to understand their behavior and potential practical uses in different areas of science and technology.