What are the Causes / Reasons of software defects?

After building software sometimes software doesn't work as expected shows bugs , errors. Why is that software system doesn't work as expected ? There may several possibilities of thes Someone used software incorrectly  Someone makes error or mistake in software Someone add invalid inputs in software Incorrect development  Issues in development  Testing missed bugs..  There may be many more reasons why the software is not...

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What is test case in Software Testing.

Test case is set of conditions, steps , variables using which tester need to test application or software in step by step manner to find out , verify , validate software is as per requirements and detect defects.  There may be many set of test cases to fulfill requirements .Main characteristics of a test case is that there is a known input  and an expected output (Expected Result ), which is worked out before the test. The known input...

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