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Symfony is a free and open-source PHP web application framework that is used to build web applications and APIs. It is designed to be flexible, scalable, and modular, making it a popular choice for developers building complex web applications. Symfony is built on top of a set of reusable PHP components called "bundles," which can be used to add specific features and functionality to an application. It also includes a number of built-in features such as routing, form handling, object-relational mapping, and security.