HDMI and USB cables are two different types of physical connectors that have distinct purposes and features. Some of the key differences between HDMI and USB cables are:

1. Purpose: HDMI cables are used primarily for transmitting audio and video signals from one device to another, while USB cables are used for transferring data and powering devices.

2. Speed: HDMI cables are generally faster than USB cables, with the ability to transmit large amounts of data at high speeds. USB cables, on the other hand, are designed to transmit smaller amounts of data but can provide power to devices.

3. Transmission Quality: HDMI cables offer superior video and audio quality, with high-definition video and audio capabilities. USB cables, on the other hand, are better suited for tasks such as charging devices or transferring small amounts of data.

4. Compatibility: HDMI cables are compatible with a wide range of devices, including televisions, monitors, and projectors. USB cables are more common in computing devices such as laptops, smartphones, and tablets.

5. Connectors: HDMI cables are fitted with a rectangular connector at both ends, while USB cables have a variety of connector types such as Type-A, Type-B, Type-C, and Micro-USB.

In summary, HDMI and USB cables are used for different purposes and have distinct features that make them suitable for different tasks. HDMI cables are best for high-quality audio and video transmission, while USB cables are better suited for charging devices or transferring small amounts of data.