In today's world, the problem of excessive environmental pollution caused by plastics is driving researchers and industry to seek alternatives to traditional plastics. In this context, this paper explores the impact of eutectic solvents as plasticizers on the properties of thermoplastic starch (TPS) and cellulose blends. Focusing on biodegradable polymers such as starch and cellulose provides sustainable perspectives to address the issue of plastic overuse. The first part of the paper extensively discusses polymer types, with a special emphasis on polymer blends and biodegradable polymers. Starch and cellulose, as representatives of renewable resources, are analyzed for their ecological advantages and adaptability through modifications such as thermoplastic starch. Additionally, methods for characterizing polymer blends are examined, such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), water vapor permeability, contact angle measurements, and mechanical properties assessment of the blends. Eutectic solvents, which are mixtures of two or more components with a lower melting point than individual components, present an innovative approach to enhancing the properties of biodegradable polymers. Their role as plasticizers can significantly improve mechanical properties, increase hydrophobicity, and reduce water vapor permeability in polymer blends. The experimental section covers sample preparation, various characterization methods, and analysis of the obtained results. This paper contributes to understanding how the use of eutectic solvents can enhance the properties of biodegradable polymer materials. Developed materials with improved characteristics represent a step forward in reducing the ecological impact of plastics, offering sustainable solutions for the future. Further research in this area could optimize processes and formulations, enabling broader application of biodegradable polymers in everyday life.