Agile software development is not only a set of tools or a single methodology, but it is a philosophy. Agile was a significant change from a traditional model called waterfall. There are several differences between Agile Tools and waterfall methodology. One of the most important differences between the agile and waterfall approaches is that waterfall features certain distinct phases with checkpoints and deliverables at each phase, while agile methods have iterations rather than phases. Waterfall methodology shows that it is possible to have perfect understanding of the requirements from the start. But in software development, concentrate on their requirement and with waterfall model the process develops rarely but definitely delivers what the customer wants even if it is what the customer asked for.
Agile Tools embrace iterations and it provides chances so that small teams can work together with stakeholders of the company. The team using agile methodology defines the requirements for the iteration, develops the code, and defines and runs integrated test scripts, and in this way users can verify the results. There are two types of two agile software development methodologies. The most widely used methodologies based on the agile philosophy are XP and Scrum. These differ in particulars but most importantly share the iterative approach. XP stands for extreme programming. It concentrates on the development rather than managerial aspects of software projects. XP is a kind of agile methodology that was designed so that organizations would be free to adopt all or part of the methodology.
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