How do critical pass/fail tests differ from regression tests?

Entry/exit criteria for testing related to priority test cases.

Verification of the stability of existing functionality after changes (defect fixes, addition of new features).

Verification of critical application functions to determine if testing can continue.

Verification of all or part of the functionality for regression defects.

Performed at the beginning of each testing iteration / after application build.

Performed after integrating changes into the existing code.

Less in volume, more focused on key functionality.

Larger volume, covering various aspects of the application.

Can be manual or automated.

Often automated to speed up and ensure reliability.

The result determines the possibility of proceeding to further testing.

The result determines the readiness of the release or the need for rework.