Iterative model and waterfall model

Illustrate the difference between an iterative model and waterfall model?

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Waterfall Model: It is a flow based model, in which we pass each and every stage once and cannot go back to that stage again.

Drawback: When there is any change in needs, then we cannot make any modifications in needs. Iterative

Iterative Model: In this we can come back to preceding stages and make the modifications accordingly. In this we revived a final output product at the end of SDLC.

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