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HDMI cables are a type of audio-visual cable used to transmit high-definition digital video and audio signals between devices, such as televisions, computers, and other electronics. They are a popular choice for connecting various components of a home theater system due to their ability to deliver crisp, clear images and sound. HDMI cables support a range of resolutions, including 720p, 1080i, and 4K, and can also transmit high-definition audio formats such as Dolby Digital and DTS. They are available in various lengths and configurations to suit different needs and setups, and some models may include features like built-in Ethernet connectivity or support for HDMI Audio Extractors. Overall, HDMI cables provide a convenient and reliable way to connect and enjoy high-definition audio and video content on a wide range of devices.