CodeQL is GitHub’s semantic code analysis engine that enables developers to query their code as if it were data. By writing custom queries, users can automatically scan codebases for security vulnerabilities, bugs, and other quality issues. CodeQL supports multiple programming languages and integrates with continuous integration workflows, making it a powerful tool for both open source and enterprise development. Its query language allows security researchers and developers to identify complex patterns and potential threats that might be missed by traditional static analysis tools. CodeQL is widely used for proactive security auditing and automated code review.