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The Waterfall approach is characterized by its linear progression through distinct phases, such as requirements gathering, system design, implementation, verification, and maintenance. Each phase must be completed before the next one begins, making it fundamentally sequential. This model emphasizes thorough documentation and requires that all requirements be clearly defined upfront, which creates a structured pathway to project completion.

In contrast, Agile development is inherently iterative and flexible. It allows for continuous feedback and adjustments throughout the project lifecycle. Agile methodologies promote adaptive planning, and regular iterations known as sprints enable teams to reassess priorities and make necessary changes based on stakeholder feedback. This adaptability is crucial for addressing changing requirements and enhancing collaboration among team members and stakeholders, ensuring that the project evolves in alignment with user needs.

The focus on regular feedback and iterations in Agile contrasts sharply with the Waterfall method's rigid structure, making the linearity of Waterfall a defining feature that sets it apart from Agile’s dynamic nature. This understanding of the two methodologies highlights the importance of choosing the appropriate approach based on project needs and the nature of requirements.