Book excerpt: Polylactic Acid-Based Nanocellulose and Cellulose Composites offers a comprehensive account of the methods for the synthesis, characterization, processing, and applications of these advanced materials. This book fills a gap in the literature as the only currently available book on this topic. This book: Describes the procedures for the extraction of cellulose materials from different sources and characterization methods adopted for analyzing their properties Covers properties, processing, and applications of PLA biocomposites made using the extracted cellulose Discusses the effect of reinforcement of cellulose on the biopolymer matrix and the enhancement of biopolymer properties Examines current status, challenges, and future outlook in biocomposite research and applications The book serves as a reference for researchers, scientists, and advanced students in polymer science and engineering and materials science who are interested in cellulose polymer composites and their applications.