The terminology used to merge a branch with an official repository is a 'pull request'. This is confusing, as it appears that I am requesting to push my changes to the official repository.
Why is it called a pull request and not a push request?
"Push" is you forcing the changes being present in the target repository. "Pull" is the target repository grabbing your changes to be present there.
A "pull request" is you requesting the target repository to please grab your changes.
A "push request" would be the target repository requesting you to push your changes.