What does the term backbone mean when it relates to a network?

In networking, the term "backbone" refers to the main infrastructure that connects different segments of a network, providing a high-capacity transmission path. It typically consists of high-speed data lines and routers that facilitate communication between various networks, such as local area networks (LANs) or wide area networks (WANs). The backbone is essential for ensuring efficient data flow and connectivity across larger distances, supporting the overall performance and reliability of the network.