In the last few decades, Nanoemulsions (NE) have gained significant interest among researchers because of their improved functional properties in comparison to emulsions. These include significant properties such as optical and rheological properties, coalescence, flocculation etc. It also shows excellent kinetic and thermodynamic stability. These NEs have been used in a variety of applications such as food, cosmetic and oil industries, preservatives, antimicrobial agent, in different drug delivery systems, cell culture technology etc. The chapter focuses on the various synthesis methods of Nanoemulsions. This will also provide insight about the important and useful properties. Applications in a variety of disciplines have also been discussed in detail.