Ethernet is network technology that employs bus topology.
That means, it consists of a single, long cable to which computers attach.
Any computer attached to a bus can send a signal down the cable, and all computers receive the signal.
Note that the computers attached to a bus network must coordinate to ensure that only one computer send a signal at any time or chaos results.
Ethernet LAN (Local Area Network) consists of a single coaxial cable, called the ether, to which multiple computers connect.