Physical disability refers to a reduction or absence of physical function that affects mobility, structural integrity, or coordination. These conditions originate from a variety of causes, including neurological damage, musculoskeletal disorders, genetic syndromes, and trauma. The biological mechanisms underlying such impairments involve altered neural signaling, compromised muscle groups, or skeletal malformation. Scientific understanding of these disabilities focuses on diagnostic classification, understanding the pathophysiology of the underlying damage, and developing rehabilitation strategies. Technological advancements, such as advanced prosthetics and supportive exoskeletons, aim to restore or augment lost physical function, thereby improving independence and functional mobility for affected individuals.