Application‑based segmentation of the Residual Beer Yeast (RBY) market is organized into four distinct categories: animal feed, food & beverage, pharmaceutical, and biofuel. Animal feed accounts for the largest share, estimated at 35% of market volume, because RBY provides a sustainable protein source that reduces reliance on conventional soy or fishmeal. The food & beverage segment, representing about 30%, leverages the nutritional profile of RBY for fortification in baked goods, dairy alternatives, and functional drinks, reflecting growing consumer demand for plant‑based ingredients. Pharmaceutical applications, comprising roughly 20%, exploit the bioactive compounds in RBY for nutraceuticals and drug delivery matrices, where regulatory compliance and purity standards command premium pricing. Biofuel utilization, though smaller at 15%, is gaining traction as RBY’s residual sugars and lipids are converted into biodiesel or biogas, aligning with circular economy objectives. This application‑centric market taxonomy quantifies each segment’s contribution, enabling analysts to assess growth drivers and allocate resources across the RBY value chain.