Primary colors are red, yellow and blue. They are the base colors that make up all other colors on the color wheel. Primary colors are used for designs that need urgency or speed, which is why fast food logos often use them. Secondary colors are orange, green and purple, which are created by mixing primary colors. Tertiary colors are made by mixing a primary and secondary color, such as yellow-orange. The color wheel shows the relationships between primary, secondary and tertiary colors.