Feature-Oriented Software Development (FOSD) is a software engineering approach that focuses on the design and implementation of software features. It emphasizes the modularization of features, allowing developers to create, manage, and evolve software systems more efficiently. By isolating features, teams can work on them independently, which enhances collaboration and reduces integration issues. In FOSD, features are treated as first-class entities, enabling better reuse and customization. This approach supports the development of product lines, where a core set of features can be adapted to create multiple products. Overall, FOSD aims to improve software quality and accelerate development cycles.