Ethernet cables connect devices in a local area network and connect devices in that network to the internet. Ethernet cables are used for hard-wired Internet connections because wireless Internet is more susceptible to interference and lag, which can lead to unstable connections.

Other electronic devices, such as microwave ovens, can interfere with the signal for some types of wireless internet. In other cases, a brick wall between your device and the WiFi router can cause problems with your connection. Even being too far away from the router can cause a slow connection.

The different types of Ethernet cables – Cat5, Cat5e, Cat6, Cat6a, Cat7, Cat7a, and Cat8 – differ in their specifications. These cables are designed to match different Internet speeds and network standards.