Backend frameworks deal with the server-side logic of web applications, handling database interactions, user authentication, server configuration, and application logic. They operate behind the scenes to manage the data exchange between the server and the client-side, ensuring the frontend has the data and resources it needs to function properly. Backend frameworks are concerned with the server-side logic of web applications. They handle database interactions, user authentication, server configuration, and much more. **When to Choose**: - If you're building an application that requires complex server-side computations, database operations, or if you're dealing with sensitive data that should not be exposed to the user. - When you need to manage HTTP requests and responses, and you want to have control over the data exchange between the server and the client. Two most popular for Python are [[Django]] and [[Flask]]. Choosing between them often hinges on project needs: Django for comprehensive solutions for larger, more complex applications, and Flask for flexibility and fine-grained control for smaller, more straightforward applications. See [[Choosing a Web Framework]]