A code review is a process where developers examine each other's code to ensure quality and functionality. This practice helps identify bugs, improve code readability, and ensure adherence to coding standards. By collaborating in this way, teams can share knowledge and learn from one another, ultimately leading to better software. During a code review, the reviewer checks for issues such as logic errors, security vulnerabilities, and performance concerns. Tools like GitHub or GitLab often facilitate this process, allowing for comments and suggestions directly within the code. This collaborative effort enhances the overall development process and fosters a culture of continuous improvement.