Agile is a flexible and iterative approach to software development that emphasizes collaboration, customer feedback, and incremental progress. It aims to deliver high-quality, more adaptive, and customer-centric software than traditional methodologies like Waterfall.

Key principles

1. Customer Collaboration Over Contract Negotiation: Agile prioritizes working closely with customers and stakeholders to understand their needs and adapt to changing requirements. It values customer feedback and satisfaction;
2. Individuals and Interactions Over Processes and Tools: Agile places importance on the people involved in the project and their communication. It values collaboration, face-to-face interactions, and teamwork;
3. Working Software Over Comprehensive Documentation: Agile values working software as the primary measure of progress. While documentation is important, it should not impede the development of functional software;
4. Responding to Change Over Following a Plan: Agile embraces change and welcomes it as a way to improve the project's outcome. It emphasizes adaptability and the ability to respond to new information and requirements.