Direct current is an electrical current that flows continuously in a single direction through a circuit. Unlike alternating current (AC), which changes direction periodically, DC maintains a constant flow of electrons from the negative terminal to the positive terminal of a voltage source. Batteries, solar cells, and rectifiers produce direct current. DC power finds applications in various fields, including electronics, telecommunications, and power transmission. It is essential in devices where a steady and constant flow of electricity is required, such as in electronic components like transistors, integrated circuits, and small electronic devices. While not as easily transferrable over long distances as AC, DC power is crucial in specific applications where a stable and unidirectional flow of electricity is necessary.