Manual Testing: Manual testing involves testers executing test cases without the use of any automated tools. It includes exploratory testing, regression testing, and user acceptance testing, ensuring the software functions as intended under various scenarios.

Automated Testing: testing utilizes specialized tools and scripts to automate repetitive but necessary testing tasks. It includes functional testing, regression testing, and performance testing automation, allowing for quicker and more efficient testing cycles.

API Testing: testing involves verifying the functionality and reliability of application programming interfaces (APIs). It ensures that APIs communicate and interact correctly with other software components and external services.