A Network Diagram is a visual representation of a computer network, illustrating how different devices, such as computers, servers, and routers, are interconnected. It helps in understanding the layout and structure of the network, making it easier to identify relationships and dependencies among various components. These diagrams can be used for planning, troubleshooting, and optimizing network performance. They often include symbols and lines to represent devices and connections, respectively. Network diagrams are essential tools for network administrators and IT professionals to manage and maintain the efficiency of their networks.