Code review is a process when your team can take a look at your code and fix all bugs.
Code review process
Take a look at the code that needs to be reviewed. If you agree with everything click on submit button. If you find something with what you do not agree with left comments and click on request changes button. Also, you can just leave comments to discuss the work done.
Benefits:
1. Increases code quality
2. Each team member can be more familiar with your code and code base at all
3. Decrease bugs count