What is priority and severity of a bug?

Severity of a bug defines how critical is the impact of the bug on the software module/system is. If the Severity of any bug is high then its priority will also be high and vice-versa.
Severity has 4 types :Critical,Major,Medium and Low Priority of a software bug  can be defined as the order in which a bug should get fixed. Higher the priority the sooner the defect should be resolved.
Priority has 3 types: High,Medium and Low.

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What Is Software Testing ?

• Software testing is the process of verifying and validating a software product against the requirement of the client. It can alternatively be defined as the process of finding bugs in the software product in order to improve the quality of the software.
• Testing is questioning a product in order to evaluate it.
• Software testing is the process used to help identify the correctness,completeness, security and quality of developed computer software.
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• Testing the test-ability of the product is called software testing.

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