Regression testing plays a pivotal role in software testing as it is responsible to ensure that any changes being made to the code do not obstruct the functioning of existing functionalities.
It is a testing method that ensures the updates and changes that have been introduced in the code do not alter or modify the existing functionalities of the software application. Whenever there is a code change being done in the application, regression testing is performed. These code changes could be updating a current feature, fixing bugs, adding new features etc.