Alzheimer's disease (AD) is a progressive neurological disorder characterized by cognitive decline, memory loss, and changes in behavior and personality, severe enough to interfere with daily life and activities. Alzheimer's typically begins slowly and worsens over time, eventually leading to severe impairment in memory, reasoning, judgment, and language skills. Alzheimer's disease is associated with abnormal deposits of proteins in the brain, specifically β-amyloid plaques and tau tangles. These deposits disrupt communication between brain cells and lead to their eventual death. Advanced age is the greatest risk factor for Alzheimer's disease, with the majority of cases occurring in individuals over 65. Other risk factors include genetics, family history, and certain lifestyle factors such as cardiovascular health and education level. There is no particular test to conclusively diagnose AD. Diagnosis is typically based on a combination of medical history, cognitive assessments, neurological exams, and ruling out other possible causes of symptoms. While there is no cure for AD, there are medications and non-drug interventions that can help manage symptoms and improve quality of life for patients.