: Testing is defined as the process of executing a program with the intent of finding errors, not proving they are absent.

Finding bugs early in the SDLC costs significantly less than fixing them after deployment. Testing activities should start as soon as requirements are defined.

White-box testing examines the internal logic, code structure, and architecture of the software application.

: Includes performance, stress, volume, and security testing.

Testing should start as early as possible in the Software Development Life Cycle (SDLC) to reduce cost and time for rework.

These tools simulate thousands of concurrent virtual users to evaluate how an application handles immense traffic, measuring stress thresholds, response times, and resource leaks. Examples include Apache JMeter, LoadRunner, and Gatling. 4. Academic and Professional Significance

Ideal for university curricula and certification exams like ISTQB. Accessing the Material

Formal, disciplined peer reviews of requirements, design, and code.

: Ensuring the product meets customer expectations and acceptance criteria.

Testing the interaction between integrated modules.

Automation tools write and run scripts to execute software actions, drastically reducing regression testing timeframes. : Selenium, Cypress, Playwright. Mobile Automation : Appium. API Testing : Postman, SoapUI, RestAssured. Performance and Load Testing Tools