The Types classification distinguishes biomass‑based precursors by their chemical origin and processing route, principally into three categories: carbohydrate‑derived, lignin‑derived, and mixed‑stream precursors. Carbohydrate‑derived precursors, such as glucose, xylose, and fructose, are produced via hydrolysis of hemicellulose and starch, and they underpin the majority of bio‑fuel and bioplastic feedstocks due to their high conversion efficiency. Lignin‑derived precursors, including phenolic monomers and aromatic compounds, emerge from depolymerization of the lignin fraction and are critical for high‑value chemicals used in pharmaceuticals and specialty polymers. Mixed‑stream precursors combine carbohydrate and lignin fractions, offering a balanced profile of oxygenated and aromatic functionalities that can be tailored for agrochemical synthesis. This taxonomy clarifies how each type contributes to overall market volume, with carbohydrate‑derived precursors driving bulk volume, lignin‑derived precursors adding premium‑price segments, and mixed‑stream precursors supporting niche, value‑added applications.