Ethernet cables are used to connect computers, routers, and other network devices. They are made of copper wires and are typically shielded to protect against interference. Ethernet cables come in a variety of lengths and speeds, ranging from Cat5e to Cat8. Cat5e is the most common type of cable and is suitable for most home and office networks. Cat6 and Cat7 cables are faster and more reliable, but are more expensive. Cat8 cables are the fastest and most reliable, but are also the most expensive. Ethernet cables are easy to install and are a reliable way to connect devices to a network.