Which type of voltage is least likely to fluctuate rapidly?

DC voltage, or Direct Current voltage, is characterized by a constant flow of electric charge in one direction. Unlike alternating current (AC) voltage, which periodically reverses direction and can vary in amplitude due to its sinusoidal nature, DC voltage remains steady over time, making it less susceptible to rapid fluctuations.

In contrast, digital voltage typically represents discrete values, which may involve transitioning between states, but can also be designed to represent a stable output. However, its nature allows for potential fluctuations when signals change. Analog voltage, which represents continuous values, can experience fluctuations as well, similar to AC, since it can take on a variety of voltages over time. Therefore, among these options, DC voltage stands out as the type least likely to experience rapid changes.