With an increased population, the globe is undergoing radical changes, resulting in shorter life cycles as living forms improve. Along with it comes the curse of mental life, as the curse of germ growth is gradually being replaced by the curse of death. The discovery of nanotechnology by world scientists is very significant in this context. Aside from everyday materials, the discovery of nanotechnology, in particular, plays a significant role in disease diagnosis, treatment, and prevention. The usage of nanosystems in medical care may aid in the treatment of cancer. Nanoparticles are appropriate for various biological objectives and have relatively high intracellular absorption compared to small particles; nonetheless, their widespread usage is still in the future. The following review discusses various methods of preparing nanoparticles, such as cross-linking, emulsion polymerization, polymerization dispersion, interfacial polymerization, solvent evaporation, double emulsion, emulsion diffusion, and salting out methods. A pictorial overview and classification, utility, and activity are provided. Specifically, drug delivery, drug dosage forms, and methods are described, as well as the appropriate polymer and its specifications. According to the initial review, further nanotechnology discoveries are essential for the survival of human life and the survival and development of organisms. In such a situation, multidisciplinary University collaboration, proper research, and proper research funding by the government and NGOs is the gap in nanotechnology, which we hope will be filled soon.