Red, blue, yellow primary color design

Quick answer：

The red, blue, and yellow primary colors are fundamental in the field of color theory and design. They are called 'primary' because they cannot be created by mixing other colors together. These colors are often used in design to evoke emotions and convey specific messages. They are foundational in the creation of a wide range of hues and are used in various design contexts such as graphic design, interior design, and fashion.