Behavior-Driven Development (BDD) is an extension of Test-Driven Development (TDD) that focuses on business drivers and provides a more outside-in approach. It aligns with the Agile framework and involves iterative planning, defining user stories and acceptance criteria, and developing features. BDD encourages collaboration among team members, including product owners, developers, QA, and design teams, to ensure everyone has a clear vision of the feature's purpose and dependencies. The process starts with epic planning, breaking down high-level milestones into smaller slices, and defining acceptance criteria for each milestone. This is followed by creating step definitions using Given-When-Then statements, which help identify whether features can be implemented through unit tests or UI interactions. BDD is tool-agnostic, and its primary goal is to facilitate conversations among team members to discover areas where clarification is needed. By doing so, teams can create a product that meets business goals while ensuring continuous feedback and refinement throughout the development process.