An HDMI (High Definition Multimedia Interface) cable is a common type of cable used to transmit high-definition audio and video signals between devices. HDMI cables are widely used to connect devices such as TVs, monitors, projectors, gaming consoles, DVD players, and computers. They come in various lengths and specifications, supporting different resolutions and refresh rates, including standard HD (1080p), Ultra HD (4K), and even higher resolutions for newer technologies like 8K.