Bionanocomposites are a novel class of hybrid materials that combine nanoscale fillers with natural bio-macromolecules to provide unique features based on their complementary molecular interactions. Advanced characterisation techniques, including X-ray diffraction, scanning electron microscopy, atomic force microscopy, and transmission electron microscopy, are essential for revealing the structural and morphological characteristics of these composites. Additionally, spectroscopic methods such as Fourier-transform infrared, X-ray photoelectron spectroscopy, and Raman spectroscopy offer critical insights into their chemical interactions. Researcher could utilise these techniques to calculate the distinct properties and behaviours of bio-nano composites that might not be seen using more straightforward analysis techniques. Determining the possible uses of bio-macromolecular matrices is well-suited in various fields, especially industrial, environmental, and biomedical applications, because the addition of nanofillers enhance their mechanical, strength, thermal stability, and biocompatibility. The electrical and optical properties of bionanocomposites can be adjusted, which offers new opportunities for their application in sensors, energy storage devices, biomedical, electronics, aerospace, automotive, and other advanced technologies. Researchers can better understand the underlying mechanism influencing these material’s behaviour by carefully characterising them, which will enable functional improvements and targeted enhancements. By utilising the distinct properties of both nanofillers and bio-macromolecules, these composites have the potential to spur advancements in several scientific and technical domains. The area of bionanocomposite materials research keeps changing, with particular emphasis on designing new natural matrices and functional nanomaterials, improving the connections among natural and nanomaterials feature for greater efficiency. The researcher further works on engineering techniques like 3D printing.