If you don’t already know, the key role of the Project Manager is to perform integration. Bring everything together.
Project Integration Management involves consolidating actions that are crucial for successfully completing the project. Note that Integration Management is high-level work and involves managing the dependencies among all other knowledge areas.
Let’s take a look at the processes of the Integration Management Knowledge Area,

Develop Project Charter
Project Charter is a document that formally authorizes the existence of a project and provides the project manager with the authority to apply organizational resources to the project activities
Develop Project Management Plan
As opposed to the Project Charter process, you don’t really create the entire plan in this process. Infact you will only integrate all the subsidiary plans into a comprehensive Project Management Plan
Direct and Manage Project Work
This is the process of leading and performing the work defined in the Project Management Plan to achieve the project objectives
Manage Project Knowledge
This is a new process introduced in the PMBOK 6. This is where you use the existing knowledge (through previous projects and experience) as well as create new knowledge as part of your current project and on the whole contributing to organizational learning
Monitor and Control Project Work
One of the most important tasks of the Project Manager is to track, review and regulate the project’s progress to meet the performance objectives defined in the Project Management Plan. This process is where all of it is done
Perform Integrated Change Control
This is the process of reviewing all the CRs, approving and managing changes to the Project Management Plan, the project deliverables, OPAs and all other project documents
Close Project or Phase
This is where the Project Manager finalizes all the activities across all the project management process groups to formally complete the project or the phase
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