Regression Testing is one of the important aspects as it helps to deliver a quality product by making sure that any change in the code whether it’s small or large does not affect the existing or old functionality.

Software testing is a process of identifying the correctness of software by considering its all attributes (Reliability, Scalability, Portability, Re-usability, Usability) and evaluating the execution of software components to find the software bugs or errors or defects.

STLC is a step-by-step approach to testing, where QA, throughout a sequence of predefined steps, ensures the quality of the product.