The valuable substance derived from rendering animal fats or the processing of certain foods is a nutrient-rich liquid. For example, the rendered fat from cooking bacon, or the whey separated during cheesemaking, are both instances of this often discarded resource.
Its importance stems from its potential for diverse applications, ranging from culinary uses to industrial processes. Historically, these byproducts were often discarded, but recognizing their inherent value has led to more sustainable practices and innovative repurposing strategies. They can be used to enhance flavor in cooking, serve as a base for sauces, or even be processed into biofuels and other valuable materials.