Visualization is when a person pictures images in one's brain depicting personal desires that one would want to happen in reality. It has been proven to relax and refuel the mind after a hard day's work. Visualization helps in lowering blood pressure and the level of stress hormones in the blood. Quieting the mind and visualizing the exact details of any stressful situation makes things manageable.
Aside from relaxation, some people actually use this technique to achieve their own personal or professional goals. Athletes commonly apply this in training where they visualize every detail or possible outcome of their competition. Others generally use this technique to deepen self-awareness where they can get touch with their intuitions.