Day-Glo Colors, also known as neons, are a type of fluorescent color that is brighter and more vibrant than traditional colors. They are often used in signs, advertisements, and other forms of visual communication. The term 'Day-Glo' was coined in the 1930s and refers to the fact that these colors appear to glow in daylight. Neons are created by combining phosphors with rare earth elements, which give them their unique properties.