Amyloid beta is a protein fragment that is produced in the brain. It is formed from a larger protein called amyloid precursor protein (APP). Under normal conditions, amyloid beta is cleared away, but in some individuals, it can accumulate and form sticky plaques. These plaques are often associated with Alzheimer's disease and can disrupt communication between brain cells. The presence of amyloid beta plaques is considered one of the hallmarks of Alzheimer's disease. Researchers believe that the accumulation of these plaques may contribute to the degeneration of neurons, leading to cognitive decline and memory loss. Understanding amyloid beta is crucial for developing potential treatments for Alzheimer's and related conditions.