The Internet, TCP/IP, and Other Stacks
Only a few short years ago you would have been hard-pressed to find 10 people outside of the computer industry who knew about the Internet. Today, it is nearly taken for granted.
The Internet is a global collection of WANs and LANs that are all interconnected. Participation in the Internet ultimately requires TCP/IP capability in the form of a node acting as an Internet gateway or portal. From that perspective, TCP/IP is the network stack of the Internet. There are other network stacks at play within the Internet, and indeed, in a variety of roles throughout the computer industry.