Question

Something produced in the making of something else is called a __________. by-product output result spinoff

Answer 1

"By-product"

Normally we would say the the answer, the output, and result are all the correct answers. However assuming you can choose one, whenever you are producing a specific object but you get something else with it, the stuff that is an addition is called a by-product.

Answer 2

The answer is by product.