Ethernet uses-

Bus topology : A bus topology is a topology for a Local Area Network (LAN) in which all the nodes are connected to a single cable. The cable to which the nodes connect is called a ''backbone''. If the backbone is broken, the entire segment fails. Bus topologies are relatively easy to install and don't require much cabling compared to the alternatives.The bus topology is e.g. used by Ethernet networks.Source: Networking Fundamentals