Django is a high-level Python web framework that promotes rapid development and clean, pragmatic design. By utilizing Django, developers can create dynamic web applications efficiently and effectively. One of the standout features of Django is its MTV architecture (Model-Template-View), which separates business logic from presentation. This structure allows developers to easily maintain and scale their applications. Additionally, Django comes equipped with a multitude of features such as an ORM (Object-Relational Mapping), which simplifies database interactions, and a robust admin interface that enables quick data management.

What sets Django apart from other frameworks is its emphasis on reusability and the Don't Repeat Yourself (DRY) principle. Developers can create modular components that can be reused across different applications, significantly speeding up the development process. Furthermore, Django is equipped with built-in security features that protect against common threats like SQL injection, cross-site scripting, and clickjacking, making it a secure choice for developers. In conclusion, understanding Django opens the door to creating powerful, dynamic web applications while ensuring maintainability and security.

When developing scalable and secure web applications with Django, it's crucial to adhere to best practices that enhance performance and security. Here are 10 essential tips to guide you:

1. Use Django's built-in features: Take advantage of Django's robust ORM, user authentication, and security features to minimize vulnerabilities.
2. Optimize Database Queries: Use select_related and prefetch_related to reduce the number of database queries, thereby improving efficiency.
3. Implement Caching: Use Django's caching framework to store frequently accessed data, significantly reducing load times.
4. Utilize Middleware: Leverage middleware for logging, authentication, or other purposes while keeping your core logic clean.
5. Regularly Update Dependencies: Ensure you keep Django and all third-party packages updated to avoid security loopholes.

Furthermore, security should always be a priority in your development:

6. Enforce HTTPS: Always use HTTPS to protect your data in transit, helping to prevent data breaches.
7. Sanitize User Input: Use Django's form validation tools to sanitize user input and protect against XSS attacks.
8. Implement Rate Limiting: Protect your application from DDoS attacks by implementing rate limiting techniques.
9. Use Environment Variables: Keep sensitive data, such as API keys and database passwords, out of version control by using environment variables.
10. Write Tests: Regularly write and run tests to catch any vulnerabilities early in the development cycle.

Deploying your Django application can seem daunting, but by breaking it down into manageable steps, you can ensure a smooth transition from development to production. Start by selecting a cloud provider or server where your Django app will live. Popular choices include AWS, Heroku, and DigitalOcean. Once you have your environment set up, it's essential to configure your database, which may involve using PostgreSQL or MySQL, as they are more robust for production than the default SQLite. Next, ensure your settings.py file is accurately configured, particularly by applying environment variables for sensitive data to keep your application secure.

After your basic configurations are complete, you should install a web server, such as Gunicorn, to serve your Django application effectively. Additionally, setting up a reverse proxy like Nginx can enhance performance by handling static files and managing client requests. Don’t forget to implement HTTPS using SSL certificates to secure your application's data during transmission. Finally, test your deployment thoroughly by running

1. Automated tests to ensure everything functions correctly.
2. Manual checks to verify the user interface.
3. Load testing to assess the performance under stress.