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Nanoemulsions are a submicron with colloidal particulate systems ranging from 10 to 1,000 nm in size. Nanoemulsions hold enormous scope in the field of cosmetics, diagnostics, food, and paint. Moreover, nanoemulsions are ubiquitously regarded as superior drug carriers for the infusion of lipophilic cytotoxic antineoplastic agents on a particular target criterion. Nanoemulsions are prepared from two immiscible liquids that are mixed by employing surfactants and co-surfactants. It also encompasses some significant benefits like biocompatibility, non-immunogenicity, low toxicity, drug entrapment, nanoscale size, large surface area, long-term and restrained release, uncomplicated mode of formulation, as well as thermodynamic stability. Nanoemulsion drug delivery can address the major challenge of effective drug formulation due to its instability and poor solubility in the vehicle. The primary objective of this chapter is to provide a quick overview of various physico-properties of nanoemulsion, with a special emphasis on its various applications in various fields.