Agile development is a popular software development methodology that emphasizes flexibility, collaboration, and iterative progress. The key idea behind Agile is to break down the development process into smaller, manageable chunks called sprints. Each sprint lasts 1-4 weeks and focuses on delivering incremental improvements to the product, allowing teams to adapt quickly to changing requirements and customer feedback. Agile contrasts with traditional Waterfall development, which follows a more rigid, linear process. Key practices within Agile include daily stand-up meetings, retrospectives, and continuous integration, all designed to foster communication, transparency, and efficiency across teams. It is used in software development to promote a flexible, customer-focused approach.