Clustering (nuclear physics) is the intrinsic tendency of nucleons (protons and neutrons) within an atomic nucleus to group together spatially, forming substructures or clusters that often resemble lighter, stable nuclei, most notably alpha particles. This phenomenon represents a significant mode of nuclear organization and excitation, distinct from the independent-particle motion model, and is a fundamental concept investigated within nuclear theory. Understanding nuclear clustering is crucial for explaining various nuclear properties, reaction mechanisms, and decay processes, and its study often involves sophisticated experimental measurements and theoretical modeling, sometimes leveraging techniques from data analysis and predictive modeling.