The waterfall model is a linear, sequential approach to software development that has been in existence since the 1970s. It consists of a series of stages, including planning, design, implementation, testing, and maintenance, that must be completed in a strict sequence. Each stage must be fully completed before starting the next stage.
This model is often compared to a flowing stream of water, as each stage flows down like a waterfall. It is a popular model for developing large, complex systems because it provides a structured and predictable method for software development. It also allows for easy tracking of progress and resource allocation.
However, the waterfall model is not flexible and does not accommodate changes well. This is because once a stage is completed, it is difficult to make changes without starting over from the beginning. Despite these criticisms, the waterfall model remains a popular software development approach, especially for projects that require clear definition and are unlikely to experience changes.
