World Alzheimer's Day is an international campaign organised by Alzheimer's Disease International to raise awareness and highlight issues faced by people affected by dementia. It takes place every year on September 21st and is the focus of World Alzheimer's Month. In support of this year’s theme – ‘Know dementia, know Alzheimer's’ - Elsevier presents a curated, open access collection of over 70 journal articles and book chapters focused on shining a light on the warning signs of dementia and the importance of a timely diagnosis.