FastAPI is a modern, high-performance web framework for building RESTful APIs in Python. It was first released in 2018 and has quickly gained popularity among developers due to its ease of use, speed, and robustness. FastAPI is based on Pydantic and uses type hints to validate, serialize, and deserialize data. It also automatically generates OpenAPI documentation for APIs built with it. FastAPI fully supports asynchronous programming and can run on Gunicorn and ASGI servers such as Uvicorn and Hypercorn, making it a good choice for production environments. Some key features of FastAPI include:

• High performance
• Type hints
• Data validation
• Automatic documentation based on OpenAPI standards
• Dependency injection

FastAPI is a good choice for building production-ready web APIs quickly and efficiently. It is also used by large companies like Uber and Netflix to develop some of their applications.