Behaviour-driven development (BDD) is a software development methodology that specifies and designs an application based on how it should behave from an outside perspective. It involves collaboration between stakeholders, product owners, developers, and testers. BDD uses scenarios written in plain English using keywords like "Given", "When", "Then" to describe features and behaviors. These scenarios serve as requirements, tests, and documentation. Frameworks like Cucumber allow automating scenario execution using a language like Java or Ruby. BDD scenarios are developed before, during, and after development to define, implement, and validate features.
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