Describe a network protocol : What is a computer network

The video tutorial explains how the internet allows global connectivity, using Facebook as an example. It introduces the concept of networks, describing them in their simplest form as two computers connected by a cable to share information. The tutorial further details how devices like a laptop and PC can be connected using an ethernet cable to share files, emphasizing that a basic network is essentially two devices exchanging information.

In what way does the internet enable global connectivity?

What are the two devices mentioned that can be connected to share information?