After a pull request has been opened, you can review and discuss the set of proposed changes.
Reviews allow collaborators to comment on the changes proposed in pull requests, approve the changes, or request further changes before the pull request is merged. Repository administrators can require that all pull requests are approved before being merged.
In a pull request, you can review and discuss commits, changed files, and the differences (or "diff") between the files in the base and compare branches.
After you open a pull request in a repository, collaborators or team members can comment on the comparison of files between the two specified branches, or leave general comments on the project as a whole.
You can view all of the comments made in a single pull request review.
If your repository requires reviews, a repository administrator or collaborator with write access must approve each pull request before it can be merged.
If your repository requires reviews, you can dismiss pull request reviews that are no longer valid or are unable to be approved by the reviewer.
When someone sends you a pull request from a fork or branch of your repository, you may want to merge it locally to resolve a merge conflict or to test and verify the changes on your local computer before merging on GitHub.