Ternary digital circuits are electronic systems that use three distinct voltage levels to represent information, unlike traditional binary circuits that use only two levels (0 and 1). This third level allows for more complex data representation and can improve efficiency in certain applications, such as signal processing and data transmission. In ternary systems, each circuit can process more information per unit compared to binary systems, potentially reducing the number of components needed. Ternary logic can be implemented using various technologies, including transistors and memristors, and is an area of ongoing research in computer science and electrical engineering.