Alzheimer's disease is a progressive neurodegenerative disorder, the most common cause of dementia among older adults. It gradually impairs memory, cognition, and eventually, the ability to carry out daily tasks. Risk factors include age, family history, and genetic predisposition. Pathologically, it involves the accumulation of abnormal protein deposits in the brain, leading to nerve cell death and brain tissue loss. Symptoms may include memory loss, confusion, mood changes, and difficulty with language or decision-making. Currently, there is no cure for Alzheimer's, but treatments can help manage symptoms and improve the quality of life for affected individuals and their caregivers.