What are the differences between Dementia and Alzheimers?

Hi. I was wondering about one thing. Is dementia the same thing as the Alzheimers? If not, what are the differences between them? Thanks in front.

Alzheimer’s disease is causing dementia . Dementia means to "remove or reduce the mind," and that's what Alzheimer's does - causing confusion, memory loss, disorientation and eventually destroying a patient's very identity. Alzheimer's is a disease, and dementia is a group of symptoms. The most common type is Alzheimers. But it is asociated with Parkinson’s disease, and others, also.