Neurodegenerative disorders are a group of diseases that involve the progressive degeneration of the nervous system, particularly the neurons in the brain and spinal cord. Common examples include Alzheimer's disease, Parkinson's disease, and Huntington's disease. These conditions often lead to a decline in cognitive function, movement, and overall quality of life. The exact causes of neurodegenerative disorders are not fully understood, but they may involve a combination of genetic, environmental, and lifestyle factors. Symptoms can vary widely, but they typically worsen over time, making early diagnosis and management important for improving patient outcomes.