What are the waterfall module, agile and Bug criteria and bug cycle

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Waterfall, Agile, Bug criteria and Bug cycle are different software development methodologies and processes used in testing.

Waterfall model is a linear and sequential approach to software development where each phase must be completed before the next phase begins.
Agile is an iterative and incremental approach to software development where requirements and solutions evolve through collaboration between self-organizing cross-functional teams.
Bug criteria are the set of rules or conditions that determine whether a reported issue is considered a bug or not. This can include severity, priority, reproducibility, etc.
Bug cycle refers to the process of identifying, reporting, prioritizing, fixing, retesting, and closing bugs in a software development project.

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