Python Django is a high-level web framework that encourages rapid development and clean, pragmatic design. It provides built-in features for building secure and maintainable web applications quickly. Django is used for web development because of its scalability, security features, and ease of use. It also promotes the DRY (Don't Repeat Yourself) principle, allowing developers to build efficient and reusable code. With Django’s ORM (Object-Relational Mapping), developers can interact with databases seamlessly, making it ideal for building data-driven applications.