Carboxylated cellulose nanofibers are widely used in the production of high-performance paper and packaging materials due to their exceptional strength and barrier properties. They enhance the mechanical strength and durability of paper products while maintaining lightweight characteristics. In the biomedical field, these nanofibers are utilized as scaffolds for tissue engineering, providing a biocompatible and biodegradable matrix for cell growth and regeneration. They are also employed in drug delivery systems, where their high surface area and functional groups allow for efficient drug loading and controlled release. Additionally, carboxylated cellulose nanofibers are incorporated into water purification systems as effective adsorbents for removing heavy metals and contaminants from wastewater. Their eco-friendly nature and versatile applications make them a valuable material in sustainable industrial and environmental solutions.