The connector used at the end of UTP (Unshielded Twisted Pair) cables in Ethernet networks is the RJ45 connector. The RJ45 connector is a standardized networking connector that is used to plug UTP cables into networking devices such as Ethernet switches, routers, and network interface cards in computers. USB, HDMI, and VGA connectors are used for different types of connections (e.g., USB for data transfer, HDMI for audio/video, VGA for video), but they are not used at the end of UTP cables in Ethernet networks.