What is Spiral model for software development? Explain the types of software systems developed using this model.

Spiral Model for Software Development:

The Spiral Model is a flexible and iterative software development process model that combines elements of both waterfall and iterative development approaches. Proposed by Barry Boehm in 1986, the Spiral Model is particularly suitable for projects with high levels of uncertainty, where requirements may change or evolve over time. It emphasizes risk management, regular feedback, and continuous refinement of the software through multiple cycles or "spirals."

The Spiral Model consists of a series of iterative cycles, each divided into four main phases:

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