Waterfall Model is the software development model that uses a seven-stage approach with a feedback loop that allows progress one step backward.
The very first Process Model to be developed was the Waterfall Model. The phrase "linear-sequential life cycle model" is frequently used to refer to it. It is easy to use and learn. There is no overlap between stages in a waterfall model; each one must be finished before the next one can begin.
It is also called to as a "linear-sequential life cycle model." It is really simple to use and understand. In this sequential design process the steps of conception, initiation, analysis, design, construction, testing, production/implementation, and maintenance are all seen as flowing continuously downward (like a cascade).
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