Symfony is a powerful, flexible, and widely used PHP framework that provides developers with a robust foundation for building web applications. It is known for its modular architecture, allowing developers to use only the components they need, making it suitable for both small projects and large enterprise applications. Symfony is based on the principle of reusability and offers extensive libraries and tools that speed up the development process. It is particularly useful for building APIs, content management systems, and complex web applications. Symfony adheres to strict standards and best practices in PHP development and integrates well with other technologies like Doctrine (for database management) and Twig (for templating engines).