What is Pull-Request ?
Pull requests let you tell others about changes you've pushed to a branch in a repository on GitHub. Once a pull request is opened, you can discuss and review the potential changes with collaborators and add follow-up commits before your changes are merged into the base branch.
Draft Pull-Request :
With draft pull requests, you can clearly tag when you’re coding a work in progress. Now when you open a pull request, a dropdown arrow appears next to the “Create pull request” button. Toggle the dropdown arrow whenever you want to create a draft instead.
A draft pull request is styled differently to clearly indicate that it’s in a draft state. Merging is blocked in draft pull requests. Change the status to “Ready for review” near the bottom of your pull request to remove the draft state and allow merging according to your project’s settings. Also, if you have a CODEOWNERS file in your repository, a draft pull request will suppress notifications to those reviewers until it is marked as ready for review.