How many types of voltage?

There are primarily two types of voltage: direct voltage (DC) and alternating voltage (AC). DC voltage maintains a constant polarity and flows in one direction, commonly used in batteries and electronic devices. AC voltage, on the other hand, changes polarity periodically and is typically used in power distribution systems and household electricity. Additionally, voltage can be categorized based on its level, such as low, medium, and high voltage, depending on the application.