What is the definition of complementary goods in economics and how do they impact consumer behavior and market demand?

Complementary goods in economics are products that are typically used together, such as peanut butter and jelly. When the price of one complementary good changes, it can impact the demand for the other. For example, if the price of peanut butter increases, consumers may buy less jelly as they are less likely to use it without peanut butter. This relationship between complementary goods can influence consumer behavior and overall market demand.