Alzheimer's disease is a progressive brain disorder that gradually affects memory, thinking, behavior, and daily functioning. It is the most common cause of dementia and mainly occurs in older adults. In the early stages, individuals may experience forgetfulness, difficulty remembering recent events, and confusion with time or place. As the disease progresses, it can lead to problems with communication, decision-making, personality changes, and loss of independence. The exact cause of Alzheimer’s disease is not fully understood, but age, genetics, lifestyle, and certain health conditions may increase the risk. Early diagnosis, supportive care, mental stimulation, healthy lifestyle habits, and appropriate medical treatment can help manage symptoms and improve quality of life for patients and caregivers.