FastAPI is a modern, fast (high-performance) a web framework for building APIs with Python 3.6+ based on standard Python type hints. One of its key features is the use of type annotations to declare request parameters and objects, which allows for automatic data validation, serialization, and documentation using the Pydantic library.

FastAPI uses the asynchronous capabilities of Python to allow for the concurrent execution of multiple requests, making it well-suited for building high-performance, highly concurrent APIs. It also includes support for dependency injection and includes features such as automatic interactive documentation using the Swagger UI and ReDoc.

In terms of performance, FastAPI is one of the fastest Python web frameworks available. According to some benchmarks, it's even faster than Node.js, Go, and Java.

To get started with FastAPI, you will need to have Python 3.6 or later installed on your system. You can then use pip to install FastAPI and its dependencies. Once you have the necessary packages installed, you can create a new FastAPI application by defining a Python function that will handle incoming requests and then using the FastAPI class to create an instance of the web application.

FastAPI also offers a lot more features, like support for OAuth2, using middlewares, testing, and deployment. Using Pydantic, also offers request data validation, serialization, and documentation feature.

FastAPI also offers a routing feature, where you can define your routes and handlers for a specific routes, it also offers options to accept query parameters, path parameters, form parameters, and handling request body.

Please refer to the official documentation for more information and on how to use FastAPI: https://fastapi.tiangolo.com/

It's also widely adopted and has a big and active community to help you.

FastAPI also provides support for webSocket, so that you can easily create real-time applications. This can be useful for creating applications such as chat apps, real-time dashboards, and more.

FastAPI is also compatible with popular ORM libraries such as SQLAlchemy and Tortoise-ORM, which allows you to interact with databases easily. This makes it easy to handle tasks such as creating, reading, updating, and deleting records in the database.

FastAPI also provides support for testing and allows you to easily test your application with tools such as pytest, and it has built-in support for test clients and test cases that can be used to simulate requests and check the response of your application.

It also has a detailed and complete documentation with clear and well-explained examples, making it easy to learn and start using it.

In summary, FastAPI is a powerful and easy-to-use web framework that is well-suited for building high-performance, concurrent, and well-documented APIs. Its use of standard Python type hints and Pydantic makes it easy to validate, serialize, and document your data, and its support for webSockets and popular ORM libraries makes it easy to handle real-time and database-related tasks.

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