What is the relationship between complementary goods in economics and how do they impact each other's demand and consumption patterns?

Complementary goods are products that are used together, such as peanut butter and jelly. When the price of one complementary good changes, it can affect the demand for the other. For example, if the price of peanut butter increases, people may buy less jelly because they are less likely to use it without peanut butter. This can impact the consumption patterns of both goods.