Dementia is a broad term used to describe a range of cognitive impairments that affect memory, thinking, communication, and daily functioning. It is not a specific disease but rather a collection of symptoms that can be caused by various underlying conditions. Dementia is characterized by a progressive decline in cognitive abilities that interferes with a person's ability to perform everyday tasks and maintain their independence.

from Times of India https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/dementia-living-alone-can-put-those-with-cognitive-decline-at-risk-finds-new-study/articleshow/102909154.cms