Development methodologies are structured approaches used in software development to organize, plan, and execute projects. They provide frameworks that help teams manage tasks, collaborate effectively, and deliver high-quality products. Common methodologies include Agile, Waterfall, and Scrum, each with its own set of principles and practices. These methodologies guide teams in addressing challenges, adapting to changes, and ensuring timely delivery. For instance, Agile emphasizes flexibility and iterative progress, while Waterfall follows a linear sequence of phases. Choosing the right methodology can significantly impact a project's success and the overall efficiency of the development process.