Biomass upgrading technologies play a critical role in transforming raw biomass into high-quality biofuels and bioenergy. These processes involve the conversion of organic materials such as agricultural residues, forestry by-products, and waste materials into more efficient and energy-dense fuels. Technologies such as torrefaction, pyrolysis, hydrothermal liquefaction, and gasification are key to enhancing the properties of biomass, making it suitable for diverse applications, from transportation fuels to electricity generation. Torrefaction and pyrolysis involve thermal decomposition at controlled temperatures, resulting in solid, liquid, and gaseous biofuels. Gasification transforms biomass into syngas, which can be further processed into biofuels or utilized for power generation. Hydrothermal liquefaction, on the other hand, uses water at high pressure and temperature to convert biomass into bio-crude, similar to petroleum crude. These upgrading technologies are crucial for improving the efficiency, stability, and storage capabilities of biomass, ultimately contributing to sustainable energy solutions and reduced greenhouse gas emissions.