The concept of “opposite” colors is based on the color wheel, which is a circular diagram that shows the relationships between different colors. Opposite colors, also known as complementary colors, are located directly across from each other on the color wheel.

The traditional color wheel is divided into primary colors (red, blue, and yellow), secondary colors (green, orange, and purple), and tertiary colors (which are created by mixing primary and secondary colors).
Purple is a secondary color, created by mixing the primary colors red and blue. Its complementary color, or opposite color, is therefore yellow, which is located directly across from purple on the color wheel.
When placed side by side, complementary colors can create a strong contrast that can be visually striking. This is why they are often used together in art, design, and fashion. For example, a purple dress can be paired with yellow accessories, or a painting with purple and blue tones can be accented with yellow highlights.
It is worth noting that the concept of opposite colors can be subjective and dependent on various factors, including cultural and personal associations with color. Additionally, there are various interpretations and variations of the traditional color wheel. For example, some color wheels may include different hues or variations of colors, which can affect the placement of complementary colors.
In conclusion, the opposite color, or complementary color, of purple is yellow. This is based on the traditional color wheel, which shows the relationships between different colors and their positions on the wheel. Complementary colors are located directly across from each other on the color wheel, and can create a strong visual contrast when used together.