A step-by-step software development process that flows downward from the phase of conception, initiation, analysis, design, development, testing, implementation, and finally to maintenance is called the waterfall model. It is a structured process where every step must be completed totally before moving on to the next one. There is no chance for any overlap of phases in waterfall model. Therefore, it is most suitable for those projects where the objectives are very clear, and requirements are stable without any changes occurring during the development process.

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