In computer networking, topology refers to the layout of connected devices. Network topologies are categorized into the following basic types:
Bus, Star, Tree, Ring, Mesh & More complex networks can be built as hybrids of two or more of the above basic topologies.

Bus Topology
Bus network uses a common backbone to connect all devices. The backbone functions as a shared communication medium that devices attach into with an interface connector. A device wanting to communicate with another device on the network sends a broadcast message onto the wire that all other devices see, but only the intended recipient actually accepts and processes the message.