Dementia is a broad term that describes a decline in cognitive abilities, severe enough to interfere with daily life. Alzheimer's disease is the most common cause of dementia, accounting for 60-80% of cases. However, there are other types of dementia, such as vascular dementia, Parkinson's disease dementia, Huntington's disease, Creutzfeldt-Jakob disease, and some forms of frontotemporal dementia. The main difference between dementia and Alzheimer's is that dementia is a general term that describes a decline in cognitive abilities, while Alzheimer's is a specific disease that causes progressive brain damage leading to memory loss, difficulty with language, and disorientation. Alzheimer's is caused by a combination of genetic and environmental factors, while other forms of dementia can be caused by different factors, such as head injury, exposure to toxins, chronic stress, and chronic health conditions.