Topology describes the network's structure and how all of its components are connected to one another. Topology is classified into two types: physical topology and logical topology. The geometric depiction of all the nodes in a network is known as physical topology. Physical topology describes the layout of devices in a network, such as their physical location. For example, in a house wiring diagram, the physical topology includes the locations of rooms, doors, windows, etc. Logical topology describes the connections between devices. In other words, it describes what links various devices together. For example, in a house wiring diagram, the logical topology includes descriptions of walls, floor plans, bridges, etc. Physical topology can be used in combination with logical topology to create a map that shows the relationships between devices. For example, a logical link may be drawn from a phone in Room A to a switch in a remote room. The physical connection could be a cable that runs through the wall from Room A to the remote room. There are many different ways to connect devices together using physical or virtual links. This makes networks complex, but also provides more flexibility than would otherwise be possible if connections had to be made in exactly one way. Physical topology is important because it allows us to place devices in certain locations according to their needs.