Parkinson's disease is a progressive neurodegenerative disorder that primarily affects movement. It is characterized by the gradual loss of dopamine-producing neurons in the brain, particularly in a region called the substantia nigra. Dopamine is a neurotransmitter involved in coordinating movement, and its deficiency leads to the characteristic motor symptoms of Parkinson's disease, including tremors, bradykinesia (slowness of movement), muscle rigidity, and postural instability. Additionally, Parkinson's disease can cause a range of non-motor symptoms, such as cognitive impairment, depression, and sleep disturbances. While the exact cause of Parkinson's disease is not fully understood, it is believed to involve a combination of genetic, environmental, and age-related factors. There is currently no cure for Parkinson's disease, but treatments are available to help manage its symptoms and improve quality of life for affected individuals.