Cellulose nanofibrils (CNFs) are nano-scale fibers derived from cellulose, a natural polymer found in plant cell walls. They are typically produced through mechanical or chemical processing of cellulose-based materials, such as wood pulp, and have a range of desirable properties. CNFs are strong and lightweight, thermally and chemically stable, and highly biodegradable, making them attractive for use in a wide range of applications, from medical products and consumer goods to industrial materials and composites.