What can the RJ45 network connector connect to?

Network connectors are of great market importance because networks require a connector. If a lot of work can't be done without a network connector, then we have friends who say, how does the connector connect? The connector also has a plug. When the connector plug is connected to the socket, it must be terminated according to the corresponding contact number. The RT45 network connector disables power until the end is locked. After selecting the correct type of RJ45 network connector, note the size of the outlet hole at the end of the plug to prevent leakage when the cable is smaller than the hole. In fact, there are many ways to use a network connector, such as: from the application level to explain, not only we often understand the network packet, but also other signals. Also, can this connector connect to other transport media besides UTP? Like coaxial cable or fiber optic? Connectors are mostly RJ45 connectors for Ethernet connections, 8P8C, can connect 4 pairs of twisted pair, 12mm wide, wider than the RJ11 series.