Poliomyelitis is an infectious viral disease primarily affecting children under five, characterized by flaccid paralysis due to the destruction of motor neurons. The disease progresses through several phases, including acute, convalescent, and chronic, with varying degrees of paralysis and the potential for deformities due to muscle imbalances. Management involves a comprehensive physiotherapy program, supportive care, and, if necessary, surgical interventions to correct deformities and improve function.