What is Project Management? Here is Wikipedia's definition - https://en.wikipedia.org/wiki/Project_management
If that is a little confusing and lacking in clarity allow me to offer a step by step illustrated guide to Project Management from initial proposal to delivery of the finished project.
This is what the customer wanted
This is the award winning design produced by the architect
Based on the architect's drawings the project management team
delivered this detailed estimate to the customer
The local planning department gave their approval after making a few recommendations
(it's elfinsafety guv, innit)
made a few more modifications
The builder finally delivered the finished project
... the customer, being English, was too polite to complain and was delighted with the result!