DC (direct current) is a type of electrical current that flows in a single direction. It is commonly used in batteries, solar panels, and electronic devices. In DC systems, the voltage remains constant over time, making it suitable for powering devices that require a steady and reliable energy source. Unlike AC (alternating current), which changes direction periodically, DC provides a stable voltage level. This characteristic makes DC ideal for applications like charging batteries and powering small electronics, such as LED lights and mobile phones.