Regression testing is software testing that checks for bugs or issues that may have been introduced into the system after changes or updates have been made. There are several types of regression testing, including Corrective Regression testing, Retest-all Regression testing, Selective Regression testing, Progressive Regression testing, Complete Regression, Partial Regression, Unit Regression, and Automated Regression Testing. 

Corrective Regression testing uses a subset of existing test cases to minimize costs and efforts needed for testing. 

Retest-all Regression testing reuses all tests but may require more time and cost. 

Selective Regression testing uses a subset of the existing test cases to reduce time and cost.

Progressive Regression testing is used when the specifications are modified and new test cases must be created. 

Complete Regression is done when changes are made on several modules and the impact is uncertain. 

Partial Regression is done to verify that the code works fine when changes are made in the code.

Unit Regression is done during the Unit Testing phase and code is tested in isolation.

Automated Regression Testing is a software testing technique that utilizes computer-based tools and techniques in testing software after it has been changed or updated.

Ensuring Stability and Reliability for Your Software

Regression testing is a process of evaluating the functionality of a software application after changes or updates have been made to it. Several different types of regression testing can be used, including corrective regression testing, retest-all regression testing, selective regression testing, progressive regression testing, complete regression, partial regression, unit regression, and automated regression testing.