Internet applications keep pushing the limits of network resources, but increasing resources is ever-more expensive. An alternative comes from control software that dynamically provides exactly the resources that applications need.
The internet is like a postal system. Although the user is only concerned with sending and receiving, many hidden systems enable the bulk transport and delivery of billions of items. Postal systems such as post boxes, collection vans, sorting/distribution centres and high-capacity vehicles are analogous to various internet network layers.
Further details: Service-aware network control