Gerrit is an open-source web-based code review tool that integrates with version control systems like Git. It allows developers to review and approve code changes before they are merged into the main codebase. This process helps maintain code quality and encourages collaboration among team members. Gerrit provides a user-friendly interface where developers can comment on specific lines of code, suggest changes, and track the status of reviews. It is widely used in software development projects, particularly in large organizations, to streamline the code review process and enhance team communication.