Neuropsychology is a branch of psychology that focuses on the relationship between the brain and behavior. It involves studying how brain functions and brain injuries or diseases can affect cognitive abilities, emotions, and behaviors. Neuropsychologists use different tests and assessments to understand how different areas of the brain contribute to specific functions, such as memory, language, attention, and decision-making. By studying the effects of brain injuries or diseases on behavior, neuropsychologists can develop interventions and treatments to help individuals improve their cognitive functioning and quality of life.