Bio-based polymers, which are environmentally benign and contribute to a range of applications, are in great demand right now. The relevance of nanocellulose polylactic acid polymers, their benefits, production processes, and the wide variety of applications given by their barrier property are highlighted in this paper. Cellulose can be defined as the final product obtained as a result of biosynthesis of plants, animals, or bacteria, and nanocellulose refers to cellulosic take-outs or materials with definite nanoscale structural dimensions. Poly (lactic acid) or polylactide (PLA) is a thermoplastic polyester, which has the ability to replace petrochemical based polymers. Poly (lactic acid), often known as polylactide (PLA), is a thermoplastic polyester that can replace petrochemical-based polymers

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