The Agile Manifesto is a foundational document for agile software development, created in 2001 by a group of 17 software developers. It emphasizes four key values: prioritizing individuals and interactions over processes and tools, focusing on working software over comprehensive documentation, valuing customer collaboration over contract negotiation, and responding to change over following a plan. In addition to these values, the Agile Manifesto outlines twelve principles that guide agile practices. These principles promote customer satisfaction, welcome changing requirements, and encourage regular reflection and adaptation. The manifesto has significantly influenced modern software development methodologies, fostering flexibility and collaboration within teams.