After developing a feature in a branch, the next step is to submit a Pull Request (PR), to merge your changes into the master branch.
After submitting a PR, the PR page may show [C] on one or more files, indicating conflicts between your feature branch and the current version of the master branch.
Rebasing your branch's changes on top of the latest version of the master branch helps ensure that your code won't destabilise the code in the master branch, when it is merged into it.