Alzheimer's is the most common form of dementia. It is a neurological
brain disorder that is irreversible, progressive, and degenerative. Alzheimer's
presents itself with a subtle onset of memory loss followed by impaired
judgement, language problems, orientation, and proper functioning. It slowly
progresses to different regions of the brain where it destroys the cells
associated there and their function. Over time, the disease causes people to
change their behavior and lose their personality, as well as slowly losing
physical function. Below is a great video that visually teaches you about this disease.