Workflow quality features like statuses, protected branches, and required status checks help collaborators make contributions that meet conditions set by organization and repository administrators.
Statuses let you know if your commits meet the conditions set for the repository you're contributing to.
If you're working on a protected branch, you won't be able to make irrevocable changes to the branch. You can enable required status checks on the protected branch that will prevent you from merging the pull request until all of the required checks pass. You can also enable required pull request reviews on the protected branch that will prevent you from merging the pull request until it's been approved.