Ethernet cables are used to connect computers, routers, and other network devices. They are available in a variety of lengths and speeds, and are essential for creating a reliable network connection. Ethernet cables are typically made of copper and come in a variety of categories, such as Cat5, Cat6, and Cat7. Cat6 cables are the most popular and offer the highest speeds, up to 10 Gbps. They are also more reliable and less prone to interference than Cat5 cables. Ethernet cables are also available in shielded and unshielded varieties, with shielded cables providing better protection against interference.