The primary purpose of this process is to review change requests, determine whether to approve them, and then manage the effects of those changes on the deliverables, organizational process assets, project documents, and project management plan.
There are fifteen processes that have Change Requests as an output. These Change Requests then all become an input into the Perform Integrated Change Control process.
In order to help determine whether changes should be approved, the Project Management Plan and Work Performance Information are used as additional information. The change control board convenes in Change Control Meetings to make the decision to approve or reject each change request.

The primary output of the Integrated Change Control process is Change Request Status Updates, meaning that these discussed Change Requests are now approved or rejected.

If a Change Request is approved, this Approved Change Request may be an input into these three processes: Direct and Manage Project Execution, Perform Quality Control, and Administer Procurements. 

Every single change that is requested or otherwise, will be processed through the Perform Integrated Change Control process.
Integrated change control is where the impact of any change is assessed against the project, and this is the reason why this is called ‘integrated’.It is because if a change were to occur in one part of a project, it needs to be assessed across the whole of the project.
The main difference between integrated change control and Monitor and Control Project Work, is that whereas Perform Integrated Change Control focuses on managing any change to project scope – Monitor and Control Project Work focuses on managing the way that such scope is executed.
For example, if a new application is requested to be added to an IT solution project, then such a change request would need to be re-evaluated via the Perform Integrated Change Control process to ensure that the impact to the rest of the system is known and understood before or such a change is approved or otherwise.