A complementary good or service is something used or provided in combination with another good or service. The word complementary means combining to enhance or emphasize each other's qualities.

It appears that the concept of complementarity will be front and center at the Synod of Bishops this October. In a nutshell, it means that two people or things complement each other and somehow belong ...

We all know that getting enough protein in our diet is beneficial to our health, but why is that? Proteins are found in every cell, tissue, and bodily fluid. It is an important component of our diet, ...