Locomotion (cellular biology) is the active, self-directed movement of a cell or subcellular structure within its environment, a fundamental process investigated within the fields of biomechanics and motion analysis as applied to the cellular level. This concept encompasses the diverse mechanisms by which cells generate force and coordinate their internal machinery to change position, including but not limited to amoeboid crawling, ciliary beating, flagellar propulsion, and the directed movement of vesicles or organelles along cytoskeletal tracks. The study of cellular locomotion is critical for understanding numerous biological processes such as morphogenesis during development, immune cell trafficking, wound healing, and the metastatic spread of cancer cells.