Parkinson's disease is a progressive neurological disorder caused by the loss of dopamine-producing neurons in the brain. It is characterized by tremors, rigidity, slowness of movement, and impaired balance and coordination. There is no cure for Parkinson's, but treatment aims to manage symptoms through medications like levodopa and deep brain stimulation surgery. Nurses play an important role in assessing patients, educating on medication management, and supporting overall care and quality of life.