Colors placed next to each other

Quick answer：

Colors that are placed next to each other on the color wheel are known as 'adjacent colors.' They are colors that share a common color base but have slightly different hues. This concept is widely used in design and art to create a sense of harmony and balance. When colors are placed next to each other, they can either complement each other or create a more subtle contrast. Artists and designers often use adjacent colors to create a cohesive look in their work.