Digital energy is an emerging field that integrates advanced digital technologies into energy systems to enhance efficiency, reliability, and sustainability. The rapid evolution of smart grids, Internet of Things (IoT), Artificial Intelligence (AI), and blockchain is revolutionizing the way energy is generated, distributed, and consumed. Digital energy enables real-time monitoring, predictive maintenance, and decentralized energy management, optimizing the use of renewable energy sources and reducing carbon emissions. However, challenges such as cybersecurity threats, high investment costs, and interoperability issues persist. This paper explores the fundamental aspects of digital energy, including its core components, benefits, challenges, and future prospects. A detailed analysis is conducted on smart grids, AI-driven energy forecasting, IoT-based management systems, and blockchain applications in energy trading. The findings highlight how digitalization enhances operational efficiency, ensures system reliability, and supports sustainable energy transitions. Future research should address security risks, regulatory concerns, and technological advancements required to improve implementation. The study provides insights into the potential of digital energy to drive a more resilient and intelligent energy infrastructure, paving the way for a digitally connected and sustainable energy ecosystem.