Color is the event of wavelengths of light hitting an object and those wavelengths reflecting back into your eyes.
Color is also an element of art with three properties: hue, saturation, and value:
Hue is the name of the color (e.g., red, blue, or yellow.)
Saturation is the quality or brightness or dullness of the hue; sometimes called “intensity”.
Value is the degree of lightness or darkness of a hue.
On a color wheel, colors are divided into groups called primary (red, yellow & blue), secondary (orange, green & violet), and tertiary (mix of a primary & a secondary).
Complementary or opposite are two colors directly opposite one another on the color wheel.