Asymmetric supercapacitors (ASCs) are advanced energy storage devices that offer higher energy density and power density compared to traditional supercapacitors. They achieve this by using two distinct electrode materials, allowing for a broader potential window and enhanced performance. The review discusses the evolution, principles, and mechanisms of ASCs, highlighting their potential in various applications. Despite their advantages, challenges remain in achieving high energy density and stability. Recent advancements in electrode materials, electrolytes, and device configurations have improved the performance of ASCs. The review also explores different types of ASCs, including capacitive, hybrid, and battery-type ASCs, and their respective advantages and challenges. The discussion emphasizes the importance of selecting suitable materials and optimizing device design to enhance the performance of ASCs. Overall, the review provides a comprehensive understanding of ASCs, their development, and future directions in energy storage technology.Asymmetric supercapacitors (ASCs) are advanced energy storage devices that offer higher energy density and power density compared to traditional supercapacitors. They achieve this by using two distinct electrode materials, allowing for a broader potential window and enhanced performance. The review discusses the evolution, principles, and mechanisms of ASCs, highlighting their potential in various applications. Despite their advantages, challenges remain in achieving high energy density and stability. Recent advancements in electrode materials, electrolytes, and device configurations have improved the performance of ASCs. The review also explores different types of ASCs, including capacitive, hybrid, and battery-type ASCs, and their respective advantages and challenges. The discussion emphasizes the importance of selecting suitable materials and optimizing device design to enhance the performance of ASCs. Overall, the review provides a comprehensive understanding of ASCs, their development, and future directions in energy storage technology.