Code refactoring is the process when developers edit and clear code without changing its functions. Code refactoring makes code more productive and maintainable, increases readability, improves testing and QA. This process helps to avoid bugs in the future and reduce costs by editing code in advance.
While experienced developers pay attention to the clarity of code, they often have to upgrade or deal with a functioning system built by another or even several other teams. In this case, refactoring is very useful. It helps to prevent the code rot and programming discrepancies, resulting from wrong classifications, code duplication, different styles of code writing by several developers.