The book is about technical aspects and formulation of nanoemulsions. Nanoemulsions are clear oil and water dispersion phase and interfacial film of surfactant used for stabilized a nanoemulsion with nanosize droplets. Nano size droplets are taken up by cells more powerfully than micromolecules and thus these carriers could be utilized as efficient drug delivery carriers. Nanoemulsions are measured to be a capable approach for brain drug delivery without any modification in drug molecule.