High-voltage direct current (HVDC) is a technology used to transmit electricity over long distances. Unlike traditional alternating current (AC), HVDC uses a constant voltage, which reduces energy losses during transmission. This makes it particularly useful for connecting renewable energy sources, such as wind farms and solar power plants, to the electrical grid. HVDC systems consist of converters that change AC to DC and vice versa. They can efficiently transport electricity between different regions, even across large bodies of water. This capability helps improve grid stability and allows for better integration of diverse energy sources into the power supply.