Ethernet/wireless is sometimes called WiFi or 802.11. It is Ethernet over an RF network and uses off the shelf RF equipment bought at the local computer stores (similar to the wireless used on your laptop). Typically there is data encryption or Key’s used to access the network to prevent Hackers accessing the network. In utilizing this type of network, initially there is some setup involved to get the LED sign talking with the master transmitting unit.
Ethernet is a wired communication method allowing an Ethernet communication card (installed in your computer) to communicate with the LED display over a Local Area Network (LAN) or a Wide Area Network (WAN). TCP/IP over Ethernet network is another term used for this.