Direct current (DC) is a type of electrical current that flows in one direction only. It is commonly used in batteries, solar panels, and electronic devices. In a DC circuit, the voltage remains constant over time, making it ideal for powering devices that require a steady flow of electricity. Unlike alternating current (AC), which changes direction periodically, DC provides a stable and predictable power source. This characteristic makes it essential for applications like charging batteries and running small electronics, where consistent voltage is crucial for performance and safety.