Numerous nanostructured material forms with varying morphological features, shapes, contents, and surface charges have been made possible by the development of nanotechnology. The development of nanoparticles has created new research opportunities in varied applications. Although nanoparticles have a solitary structural framework, as the term suggests, their core and shell components have various structures. Core–shell materials have garnered more attention in recent years because of their many benefits and diverse range of applications. The primary difference between these materials and simple nanoparticles is that their multidimensional structure greatly boosts their capabilities. Their elevated surface powers, hydrophilic nature, chemical and thermal steadiness, and bioactivity make them the ideal choice for biomedical and sensor applications. Since the synthesis of nanoparticles is a complicated process, there are numerous methods for creating distinct kinds of core–shell biopolymer nanoparticles. Plant based resources seem to be the best options for major green core–shell nanoparticle synthesis, despite the fact that a variety of natural resource have been used to create these particles.