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Branch policies in Azure DevOps are a set of rules and restrictions that you can apply to branches in your source code repository. They help ensure code quality, maintain a stable codebase, and enforce team-specific processes. Here are some key points about branch policies:

1. Code Review Policy: This policy requires that all changes to a branch must be reviewed by one or more designated reviewers before they can be merged into the branch. This helps maintain code quality and encourages collaboration.

2. Build Validation Policy: This policy ensures that changes made to a branch do not break the build. Before changes can be merged, they must pass a specified build pipeline successfully.

3. Status Checks Policy: Status checks are automated verification processes that run before changes can be merged. These checks can include code analysis, unit tests, and other quality gates. Only after all required status checks pass can a merge be allowed.

4. Work Item Linking Policy: This policy enforces a requirement to link work items (such as user stories or bugs) to code changes. This helps track the reasons behind each change and maintains traceability.

5. Comment Resolution Policy: This policy ensures that all comments in a pull request (or merge request) are resolved before the changes are merged. It helps prevent any unresolved discussions from being lost.

6. Minimum Reviewers Policy: This policy mandates a specific number of reviewers for each pull request. It helps ensure that changes are reviewed by an adequate number of team members.

7. Required Reviewers Policy: Similar to the minimum reviewers policy, this policy enforces the presence of specific reviewers for pull requests. This is useful for involving specific experts in certain areas of the codebase.

8. Automated Policies: Azure DevOps allows you to create custom policies using automated checks. These can be implemented using custom scripts, extensions, or integrations with external tools.