Biomass depolymerization plays a crucial role in biofuels and bioenergy by breaking down complex biomass structures into simpler molecules. This process, often facilitated by chemical or biological methods, transforms lignocellulosic materials, such as agricultural residues and wood, into valuable energy carriers. Enzymatic depolymerization utilizes specific enzymes to hydrolyze cellulose and hemicellulose into fermentable sugars, which can then be converted into ethanol or other biofuels. Chemical methods, like acid hydrolysis, also decompose biomass polymers, providing feedstocks for advanced biofuels. Effective depolymerization enhances the efficiency of biofuel production, making renewable energy sources more viable and sustainable by optimizing biomass utilization and reducing waste.