Code Review is the systematic examination of source code intended to find and fix mistakes overlooked in the initial development phase. It involves reviewing code changes by peers or automated tools to ensure that the code meets quality standards, follows best practices, and is free of defects. Code reviews help identify bugs, improve code maintainability, and facilitate knowledge sharing among team members. They are typically conducted using version control systems and code review tools like GitHub Pull Requests, GitLab Merge Requests, and Bitbucket. Effective code reviews contribute to higher software quality, better collaboration, and more robust and secure codebases.