An Ethernet connector (RJ-45) is widely used to connect devices to a network via a wired connection, providing a stable and often faster internet connection compared to wireless alternatives. The Telephone connector (RJ-11) is used for landline telephones and DSL connections but isn't suitable for direct internet connections without a modem. USB is a common interface for peripheral devices and does not typically connect to the internet directly. HDMI is used for audio/video signals between devices like monitors, TVs, and media players, and isn't used for internet connectivity.