For the past few decades, there has been a considerable research interest in the area of drug delivery using particulate delivery systems as carriers for small and large molecules. Particulate systems like nanoparticles have been used as a physical approach to alter and improve the pharmacokinetic and pharmacodynamic properties of various types of drug molecules.  Nanoparticles promise to revolutionize medicine and increasingly used in drug delivery. The purpose of this review is to explore the design, development of nanotechnology, different method of preparation and application. By making the drug into nanoparticles by using different method of preparation, which may alleviate the manifestations of disease with minimal dose and less toxicity. These drug delivery systems can be potentially translated into targeted cellular and tissue-specific clinical applications designed to achieve maximal therapeutic efficacy with minimal side effects.