What is the definition of complementary goods and how do they relate to each other in the market?

Complementary goods are products that are used together or in conjunction with each other. They are often purchased and consumed together because they enhance the value or utility of each other. In the market, the demand for one complementary good is directly related to the demand for the other. When the price of one complementary good changes, it can impact the demand for the other complementary good.