D.C. (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. Unlike alternating current (A.C.), which changes direction periodically, D.C. provides a steady voltage, making it ideal for powering devices that require a constant energy supply. In D.C. systems, the voltage remains constant over time, which allows for precise control of electrical devices. This characteristic is essential in applications such as computers, LED lighting, and electric vehicles, where stable power is crucial for performance and efficiency.