Project managers often choose between the Waterfall and Agile methodologies for project life cycles, each offering distinct approaches to software development. Waterfall is a traditional, linear method characterized by its sequential process, requiring thorough documentation and clear requirements at the start, which can lead to challenges if changes are needed later. In contrast, Agile is an iterative approach that divides projects into phases called sprints, allowing for continuous client collaboration and flexibility in adapting to changes, making it particularly suitable for projects that evolve over time. Agile's emphasis on teamwork and regular feedback often leads to higher-quality products, although it can lack comprehensive documentation and requires proficient, self-reliant team members. While Waterfall offers predictability and a clear timeline, Agile's adaptability and frequent product visibility make it increasingly popular, especially for projects needing rapid delivery and frequent updates. Despite their differences, both methodologies have their pros and cons, with the choice depending on the project's specific requirements and goals.