DC power connectors. These are commonly used for supplying direct current from a power source to small to medium electronic devices.
The most common style is the "barrel connector".
They typically feature an insulated cylindrical tip that accepts a pin from a corresponding socket.
The red and black wires indicate positive and negative polarity, aiding in correct installation and secure connection.
These connectors provide a simple and secure DIY solution for DC power connectivity, often used with power adapters or power supply boxes.