In recent years, the subject of internationalization has been one of the most discussed issues in academic and university centers. Experts in the higher education believe that this subject is a new paradigm and inevitable approach in the universities and curriculum. Internationalization refers to the process of integrating an international and intercultural dimension into the teaching, research and service functions of the institution. It is a term that is being used more and more to discuss the international dimension of higher education. It is a term that means different things to different people and is thus used in a variety of ways. The purpose of this study is, surveying the nature of internationalization of higher education and its causality, practical models and specifying it holistically for stakeholders of higher education systems.