Parent and child companies?

Hello;

What is the benifit of using parent and child company?
Why not to make each company independent of other?

Regards
Bilal

Parent-child structure is useful for companies which have subsidiaries and would like to generated consolidated reports in ERPNext:

https://erpnext.com/docs/user/manual/en/accounts/accounting-reports

You still have the ability to create independent companies in the same instance.