Blue and yellow are adjacent colors

Quick answer：

Adjacent colors, also known as analogous colors, are colors that are next to each other on the color wheel. In the case of blue and yellow, they are not directly adjacent but are part of the analogous color scheme. The color wheel typically places red and yellow next to each other, with orange as a bridge color, followed by yellow-green, green, blue-green, and blue. This arrangement is based on the perception of colors in human vision and the way they are mixed in pigment and light.