What is By-product?
A '''by-product''' is something that is made or produced while a product is [[manufacture]]d in a factory. Usually, the by-product is not used, and it becomes [[waste]] that is put in a [[landfill]] or [[garbage dump]]. Sometimes by-products are [[toxic waste|toxic]] materials which are dangerous to humans, animals, and plants. Some companies are trying to find ways to reuse or recycle the by-products, instead of putting them into landfill or garbage dumps as waste. [[Animal]] ''by-products'' are produced by slaughterhouses (places designed to kill animals for food). Animal by-products are the parts of the animals that cannot be eaten by humans. Animal by-products are sometimes included in non-[[human]] foods, such as [[pet food]] or animal feed (for farm animals). {{stub}} [[Category:Waste]]