What types of testing have you worked with in practice?

In practice, I have worked with several types of testing:

• Functional testing — verifying that the functionality meets the requirements.
• Regression testing — ensuring that new changes do not break existing functionality.
• Integration testing — checking the interaction between modules.
• Automated testing — writing scripts to automate repetitive tests.
• Performance testing — load testing to evaluate the speed and stability of the system.
• Security testing — checking for vulnerabilities and data protection.

For example, in one project, I wrote automated tests using Selenium for functional and regression testing of a web application.