Neuroimaging is a set of techniques used to visualize the structure and function of the brain. It helps researchers and doctors understand how the brain works and identify abnormalities. Common methods include MRI (Magnetic Resonance Imaging), which provides detailed images of brain anatomy, and fMRI (functional MRI), which measures brain activity by detecting changes in blood flow. These techniques are crucial in various fields, including neurology, psychiatry, and cognitive neuroscience. They assist in diagnosing conditions like stroke, tumors, and Alzheimer's disease, as well as in studying brain functions related to memory, emotion, and decision-making.