Current types refer to the flow of electric charge in a circuit. The two main types are direct current (DC) and alternating current (AC). DC flows in one direction, making it ideal for batteries and electronic devices. In contrast, AC changes direction periodically, which is commonly used in household power supplies. The choice between DC and AC depends on the application. DC is often used in low-voltage applications, while AC is preferred for high-voltage transmission over long distances. Understanding these current types is essential for designing and using electrical systems effectively.