Supercontinuum generation is the process involving the extreme spectral broadening of an optical pulse as it propagates through a nonlinear medium, resulting in a coherent light source spanning a significantly expanded bandwidth. As a research concept and phenomenon within optics and photonics, it investigates the complex interplay of various linear (e.g., dispersion) and nonlinear (e.g., self-phase modulation, four-wave mixing, stimulated Raman scattering) optical effects that collectively drive this spectral expansion. The resulting supercontinuum is characterized by its high spatial coherence and brightness across a wide spectrum, making it a significant resource for diverse applications in areas such as spectroscopy, frequency metrology, and biomedical imaging.