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 in connecting devices like televisions, computer monitors, video game consoles, Blu-ray players, and streaming devices to other audiovisual equipment.

Here are some key features and aspects of HDMI cables:

1. High Definition Transmission: HDMI cables support high-definition video and audio signals, providing superior quality compared to older analog connections like VGA or RCA.

2. Digital Transmission: HDMI cables transmit signals digitally, which helps maintain signal integrity and reduce interference for clearer audio and video quality.

3. Audio and Video in One Cable: HDMI cables can carry both audio and video signals, simplifying connections between devices and reducing cable clutter.

4. Versions and Specifications: HDMI cables come in different versions, with each version offering different capabilities in terms of resolution, refresh rates, and other features. For example, HDMI 2.0 supports 4K resolution at 60Hz, while HDMI 2.1 supports even higher resolutions and refresh rates.

5. Compatibility: HDMI cables are generally backward compatible, meaning that newer devices with higher HDMI versions can usually work with older HDMI cables and devices. However, to take advantage of newer features, it's often best to use cables and devices that support the latest HDMI version.

6. Length and Quality: HDMI cables are available in various lengths, ranging from a few feet to over 50 feet. Longer cables may require higher quality construction to maintain signal integrity over longer distances.

7. Connectors: HDMI cables feature standardized connectors with male plugs on both ends, designed to fit into HDMI ports on devices. The most common HDMI connector types are Type A (standard), Type C (mini), and Type D (micro).