Orange, blue, purple, adjacent colors

Quick answer：

Adjacent colors refer to hues that are close to each other on the color wheel. In the context of orange, blue, and purple, these colors are considered adjacent because they are located near each other on the color spectrum. Orange is a secondary color formed by mixing red and yellow, blue is a primary color, and purple is a secondary color formed by mixing blue and red. When used together, these colors can create harmonious and visually appealing color combinations.