An Internet backbone refers to one of the principal data routes between large, strategically interconnected networks and core routers on the Internet. Major cloud providers are connected to the internet backbone to be able to offer you as a customer Infrastructure as Service.
MAJOR INTERNET BACKBONE EXAMPLES
Major internet backbone examples include commercial, educational, government, and military entities. Some examples of the largest companies that make the internet backbone include: Sprint, UUNET, AT&T, GTE, Nextel, and more.
What do we mean by this?
A major highway that connects a city.