Energy Internet integrates small-scale renewable energy systems, electric loads, storage devices, and electric vehicles for effective transaction of power backed by emerging technologies such as Internet of Things, vehicle-to-grid, and blockchain. Energy Internet,sponsored by Chinese Society for Electrical Engineering (CSEE), and published by China Electric Power Research Institute (CEPRI) in cooperation with the Institution of Engineering and Technology (IET), is a multidisciplinary gold open access journal covering power and energy, power. The Energy Internet represents a transformative paradigm integrating advanced power systems, distributed renewable energy, and digital technologies to achieve efficient, resilient, and sustainable energy management. As global decarbonization efforts intensify, the Energy Internet's core. Energy Internet, a futuristic evolution of electricity system, is conceptualized as an energy sharing network. In consequence, a comprehensive review of energy internet. In this paper, the technology, characteristics, development status and the necessity of application of energy Internet are deeply studied, and then the future trend of energy Internet is analyzed.