review workflows: Differential is used for pre-push code review, called "reviews" elsewhere in the documentation. You can learn more in Differential User Guide. Audit is used for post-push code reviews, called "audits" elsewhere in the documentation. You can learn more in Audit User Guide. (By "pre-push", this document means review which blocks deployment of changes, while "post-push" means review which happens after changes are deployed or en route to deployment.) Both are lightweight, asynchronous web-based workflows where reviewers/ auditors inspect code independently, from their own machines -- not synchronous review sessions where authors and reviewers meet in person to discuss changes.