Parkinson's disease, named after Dr. James Parkinson who first described it in 1817, is a progressive neurodegenerative disorder characterized by motor symptoms such as tremors, rigidity, and bradykinesia. It is caused by factors such as loss of dopamine neurons, genetic mutations, and neuroinflammation, affecting approximately 9.3 million people worldwide as of 2023. Management includes pharmacological treatments like levodopa, non-pharmacological therapies like physical therapy, and surgical options such as deep brain stimulation.