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various researcher are innovate a replacement therapy regarding improvement of drug action. Improve drugs absorption, distribution also we improve its efficacy. Amongst that a replacement innovative technology are develops. A nanoemulsion is technique to enhance the solubility, bioavability, pharmacokinetic and pharmacodinemics of medicine .in this review article us familiar about the novel technique nanoemulsion and its preparation methods, charactorization of nanoemulsion. Nanoemulsion has been identified as a promising delivery system for various drugs including biopharmaceuticals. Nanoemulsion may be a heterogeneous system composed of one immiscible liquid dispersed as droplets within another liquid. The droplets size of nano emulsion is between 20 to 500 nm. Diameter and surface properties of droplets of nanoemulsion plays a crucial role in the biological behavior of the formulation. Small droplet sizes cause transparent emulsions so that product appearance is not altered by the addition of an oil phase during this paper various aspects of nanoemulsion have been discussed including advantages, disadvantages and methods of preparation. Furthermore new approaches of stability of formulation, effect of types and concentration of surfactant, process variables and method also are discussed to improve the stability of nanoemulsion formulation.