Final answer:
Complementary colors are pairs of colors found opposite each other on a color wheel and can be used to create a dramatic effect in artworks.
Step-by-step explanation:
Complementary colors are pairs of colors that are found directly opposite one another on a color wheel. Examples of complementary color pairs include red and green, yellow and purple, and orange and blue. These colors create a visual tension when placed near each other and can be used to create a dramatic effect in artworks. For instance, the painting 'Untitled' by Keith Haring showcases the use of complementary colors.