It just formed there in my head. To share network resources computers need to communicate with each other. To do this, computers can send electronic signals using bounded or unbounded media. The signals sent over the transmission media represent network data.
Most networks use a combination of cable and wireless media to link computers.
Each media type has characteristics that may or may not make it suitable for your network. But because money is always an issue the network designer must decide if the expense is worth the performance high-capacity transmission media like fiber can provide. In most cases, a suitable alternative can deliver appropriate performance while keeping expense under control. In reality, installation is never easy, but some media are easier to install then others. In addition, some may require that the installer have special skills.