I/O connectors refer to input/output connectors, which are physical interfaces used to transfer data between two devices. I/O connectors are designed to connect various components such as a device, computer, peripheral, or other hardware and allow them to communicate with each other. I/O connectors can come in various form factors and connectors such as D-SUB connectors, USB, HDMI, Firewire, and Ethernet. Common uses for I/O connectors include connecting peripherals, such as networks, video cards, storage, audio equipment, and more.