What is the difference between acceptance testing and regression testing?

Acceptance Testing is conducted to verify whether the system meets the customer's requirements and is ready for operation. It is usually the final stage of testing, where functionality is checked from the user's perspective.

Regression Testing aims to verify that changes made (such as bug fixes or new features) have not disrupted the existing functionality. It is performed after each change in the code.

In summary:

• Acceptance testing checks the system's compliance with requirements and readiness for release.
• Regression testing checks stability and absence of side effects after changes.