Question

What are the differences between dementia and Alzheimer's disease?

Answer 1

Dementia is a generic term for a condition manifest by gradual loss of cognition, memory and reasoning. Alzheimer's Disease is one specific type of dementia.

Explanation:

This site explains it very well. :)

http://www.healthline.com/health/alzheimers-disease/difference-dementia-alzheimers#Overview1