As a best practice, when we want to merge a topic or feature branch back into the main branch we create a pull request. Developers sometimes may need to communicate some extra information with reviewers or bring their attention to specific details. In VSTS, labels provide a new way of communication for pull request.
You can tag your pull requests with labels like “Hotfix” or “Dependency” or even “DON’T MERGE” and draw reviewer attention to an important details. Nowadays, many teams communicate things like this during the stand-ups or even through communication tools like Slack or Microsoft Team. However, when it comes to enterprise level app and big teams, traditional ways are not really practical because communications can easily get lost between team members.