Because testing everything is not feasible.
What is meant by prototype in SDLC?
How GUI testing will be done in manual testing for a website?
What are starting links to test while website testing?
What is test scenario and test case? Please explain in detail?
Difference between strategic test plan & test plan?
What is back end testing using SQL?
How do you Test Application with having any requirement and Document?
What will be the Test case for ATM Machine & Coffee Machine?
What is the difference between stress, volume and load testing?
What is test deliverables?