What is code refactoring?

Code refactoring is the process of restructuring existing computer code—changing the factoring—without changing its external behavior. It is intended to improve the nonfunctional attributes of the software, such as readability, to simplify the structure of code, to change code to improve extensibility, to enhance its maintainability, or to lay the groundwork for future changes. It is commonly used to improve code quality, reduce technical debt, and make the code easier to understand and modify.