Agile development refers to a set of methodologies that emphasize incremental, iterative progress in software development. It focuses on collaboration, flexibility, and customer feedback, allowing teams to adapt to changing requirements more easily. Agile approaches, like Scrum and Kanban, promote regular check-ins and short development cycles, called sprints. This method enhances project visibility, encourages stakeholder engagement, and improves the quality and speed of delivery, aligning closely with users' needs throughout the development process.