Software testing is performed at different levels to ensure the application is error-free and meets requirements:
- Unit Testing: Focuses on testing individual code units or components for correctness.
- Integration Testing: Verifies that combined modules interact and function together as intended.
- System Testing: Examines the entire system against defined specifications to validate its overall functionality.
- Acceptance Testing: Ensures the software meets user requirements and is ready for deployment.
These testing levels help identify issues at various stages, improving software quality and reducing risks before release.