"Blue and Yellow" refers to two primary colors in the color wheel. Blue is often associated with calmness and stability, while yellow is linked to happiness and energy. These colors can be mixed to create green, a secondary color. In art and design, blue and yellow are frequently used together to create vibrant contrasts. They can be found in nature, such as in the sky and sunflowers. The combination of these colors is also popular in branding and marketing, as it can evoke feelings of trust and optimism.