Please advise what is the difference between dementia and alzheimer's disease?

Alzheimer's is: A very specific and the most common form of dementia. Dementia can be caused by several other factors, many of which can be controlled, at times even reversed.

Dementia types: Alzheimer's disease is one type of dementia. It is a neurodegenerative dementia, which cannot be reversed and gradually worsens over time. However, some medications can help to slow the process. Other types of dementia include fronto-temporal dementia, lewy body dementia, and vascular dementia. Some dementias can be treated, so proper diagnosis is important.