Any color that is chosen opposite of one another on the color wheel is considered a complementary color.
These colors are often described in comparison with one another as high contrast, high energy (especially when they involve a primary color). These must be used sparingly as a "pop" of color or as an accent for dramatic purpose. If overused, the end user can be left feeling overwhelmed and uneasy.
Physical spaces, such as walls, should also incorporate a few neutrals along with the complementary palette in order to make it appealing on an everyday level.2013 Tracy Berry