The digital transformation of society is not a recent topic. Technology is everywhere, via connected watches, in our pockets with our smartphones and at home with connected objects. It connects us to a world that makes our lives easier and creates interconnections between people and businesses. This new world created by us and for us uses our data to facilitate our daily lives and deepen our links with consumption. The emergence of new tools based on Artificial Intelligence, and some technological transformations based on Big Data, as well as the development of the use of Internet of Objects, push for a profound change impacting all the business processes of the enterprise. A large number of studies have been conducted in the field have tried to give a comprehensive portrait to understand some aspects of digital transformation better. The purpose of this study is to form a basis for future studies which may help future studies to understand the digital transformation and its characteristics better and also to build a framework of digital transformation. The purpose of this study is to give a comprehensive state of the art of digital transformation through a review of 164 that can serve as a basis for a roadmap for digital transformation.