A series of materials called superionic conductors, which exhibit high ionic conductivity, have been attracting attention in terms of their engineering application as solid electrolytes. In promoting such an application, the importance of basic research based on, for example, physics and chemistry, has been recognized, and has led to the establishment of an academic field called solid- state ionics in which science and engineering have been integrated. Superionic conductors are highly promising functional materials. As a stepping stone in the development of new superionic conductors that can be utilized as functional materials, this work presents to beginners a basic general study of superionic conductors, show the importance of more research into evolving new superionic solids, review relevant contemporary researches and highlight the contemporary areas of application of superionic solids in modern day technology.