Why do enterprises create local networks if the Internet exists and everything can be stored and transmitted there?

Question

Computer networks

Why do enterprises create local networks if the Internet exists and everything can be stored and transmitted there?

Answer 1

1. The main reason: uncontrolled access to the placed/transferred business data of the enterprise on the Internet.
Next, another row :
2. The stability of the business, independent of the Internet connection.
3. A narrow channel for connecting to the Internet with a large number of employees in one office/building (bottleneck) and, as a result, a huge loss in the speed of data exchange both between employees and with external resources.
4. The possibility of complete loss of information at any time and without a chance of recovery for reasons beyond the control of the business.

Answer 2

Why do people build individual huts for themselves - with walls, roofs, doors in a warm tropical climate - after all, you can just put up a canopy from the rain? Probably because not everyone likes to fuck in public :)