What are the differences between Django, Django REST Framework, FastAPI, and Flask in the context of web application development?

All the listed frameworks are used for developing web applications in Python, but they have different features:

• Django — a full-featured framework with a large set of tools "out of the box": ORM, authentication, admin panel. Suitable for creating complex websites.

• Django REST Framework (DRF) — an extension for Django that simplifies the creation of REST APIs, adding serialization, authentication, and other API capabilities.

• Flask — a minimalist microframework that provides a base for creating web applications but requires additional libraries to extend functionality. Good for small projects and when flexibility is needed.

• FastAPI — a modern framework for building high-performance APIs with support for asynchronous programming and automatic documentation generation. Uses Python typing for data validation.

Example: if you need to quickly create a simple site — Flask; if a complex site with an admin panel — Django; if REST API — DRF or FastAPI (FastAPI is preferable for asynchronous and high-load services).