What is the Waterfall Model in SDLC?

The waterfall model of the software life cycle which 1st put forward by Royce in 1979. It become popular in the 1970s. However, when Boehm brought attention to it. there are many variants of the waterfall model depending on the organisation the use the model and the specific projects. 

Fig 1: Linear-Sequential Waterfall model

The Above figure depicts Linear-Sequential Waterfall model. 

Another variant of the waterfall model is the one in which each phase's results flow into the next and the process. Ideally process in an orderly fashion. this can be illustrated from the following figure. 

Fig 2 : Waterfall Model

In the waterfall model "With feedback the process is structured as a cascade of phases where the output of one phase constitute the input to the next one. The Waterfall model consist of the Following Phases.

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