Demen is a term that refers to a specific type of mental decline, often associated with aging. It encompasses various cognitive impairments, including memory loss, difficulty in communication, and challenges in reasoning. This condition can significantly impact daily life and the ability to perform everyday tasks. The most common form of demen is Alzheimer's disease, which affects millions of people worldwide. Other types include vascular dementia and frontotemporal dementia. Early diagnosis and intervention can help manage symptoms and improve the quality of life for those affected and their caregivers.