Abstract3.1 Introduction3.2 The microstructure of plant fibers—kenaf fibers3.3 The production, structure, and properties of cellulose nanofiber using a grinder3.4 The production, structure, and properties of cellulose nanofiber using other methods3.5 The intrinsic mechanical properties of cellulose nanofibers3.6 Cellulose nanofiber composites3.7 Future trendsReferences