RJ45 connectors are widely used for networking cables such as Cat 5e, Cat 6, and Cat 6a to provide wired LAN connections. They are an essential component in setting up Ethernet networks. Being familiar with this connector is critical as it is the standard for wired network connections. In contrast, RJ11 is a smaller connector typically used for telephone lines, DB9 for serial connections, F type for cable television and antenna setups, and USB-C for various digital data connections and power supply. CC3 is not a real type of connector.