Biodegradable polymeric nanoparticles (BPNPs) are promising drug delivery systems due to their ability to enhance the efficacy of various therapeutic agents by enabling targeted delivery. These nanoparticles, made from biodegradable polymers, are particularly effective for drugs with poor solubility, instability, or rapid metabolism. BPNPs offer advantages such as biocompatibility, biodegradability, controlled drug release, and minimal toxicity. They can be used for both hydrophilic and hydrophobic drugs and are effective for oral administration, protecting sensitive drugs from degradation in the gastrointestinal tract. The review discusses the classification, formulation, characteristics, and biomedical applications of BPNPs. Natural and synthetic polymers, such as chitosan, alginate, PLA, and PLGA, are commonly used as nanocarriers. The review highlights various methods for nanoparticle fabrication, including self-assembly and emulsification, and emphasizes the importance of physicochemical characterization for ensuring their stability and functionality. BPNPs have been successfully applied in drug delivery, gene therapy, tissue engineering, and biosensing, with examples including the delivery of anticancer, antifungal, and antiviral drugs. Despite their potential, challenges remain, including ensuring nanoparticle stability under physiological conditions, scaling up production while maintaining quality, and minimizing toxicity. The review also addresses the need for in vivo studies and clinical trials to fully evaluate the safety and efficacy of BPNPs. Future research should focus on improving drug encapsulation efficiency, controlled release, and targeted delivery. The development of novel nanoformulations with enhanced stability and specificity is expected to improve therapeutic outcomes and reduce side effects. Multidisciplinary research involving biologists, chemists, engineers, and nanotechnologists is essential for advancing BPNP-based therapies.Biodegradable polymeric nanoparticles (BPNPs) are promising drug delivery systems due to their ability to enhance the efficacy of various therapeutic agents by enabling targeted delivery. These nanoparticles, made from biodegradable polymers, are particularly effective for drugs with poor solubility, instability, or rapid metabolism. BPNPs offer advantages such as biocompatibility, biodegradability, controlled drug release, and minimal toxicity. They can be used for both hydrophilic and hydrophobic drugs and are effective for oral administration, protecting sensitive drugs from degradation in the gastrointestinal tract. The review discusses the classification, formulation, characteristics, and biomedical applications of BPNPs. Natural and synthetic polymers, such as chitosan, alginate, PLA, and PLGA, are commonly used as nanocarriers. The review highlights various methods for nanoparticle fabrication, including self-assembly and emulsification, and emphasizes the importance of physicochemical characterization for ensuring their stability and functionality. BPNPs have been successfully applied in drug delivery, gene therapy, tissue engineering, and biosensing, with examples including the delivery of anticancer, antifungal, and antiviral drugs. Despite their potential, challenges remain, including ensuring nanoparticle stability under physiological conditions, scaling up production while maintaining quality, and minimizing toxicity. The review also addresses the need for in vivo studies and clinical trials to fully evaluate the safety and efficacy of BPNPs. Future research should focus on improving drug encapsulation efficiency, controlled release, and targeted delivery. The development of novel nanoformulations with enhanced stability and specificity is expected to improve therapeutic outcomes and reduce side effects. Multidisciplinary research involving biologists, chemists, engineers, and nanotechnologists is essential for advancing BPNP-based therapies.