Agile is an iterative approach to managing software development projects that focuses on continuous releases and incorporating customer feedback with every iteration
Agile manifesto
Agile values
Individuals and interactions over processes and tools
Working software over comprehensive documentation
Customer collaboration over contract negotiation
Responding to change over following a plan
Individuals and interactions
Working software
Customer collaboration
Responding to change
Agile principles
Deliver working software frequently, from a couple of weeks to a couple of months, with a preference to the shorter timescale.
The most efficient and effective method of conveying information to and within a development team is face-to-face conversation.
The best architectures, requirements, and designs emerge from self-organizing teams.