• High performance: FastAPI is built on top of the ASGI server, which provides high-performance web applications with low latency and high throughput. It is also designed to take full advantage of Python's type annotations and is highly optimized for speed and performance.
• Easy-to-use: FastAPI provides developers with an easy-to-use framework for building APIs with Python. It includes an intuitive and well-documented API that makes it easy to get started quickly, even for developers who are new to web development.
• Automatic documentation: FastAPI automatically generates documentation for the API based on the type annotations in the code. This makes it easy for developers to keep their documentation up-to-date and makes it easy for users to understand how to use the API.
• Scalability: FastAPI is designed to be highly scalable and can handle a large number of requests with ease. It also provides built-in support for async/await, which makes it easy to write asynchronous code and handle large numbers of concurrent connections.
• Compatibility: FastAPI is compatible with a wide range of web servers and databases, making it easy to deploy web applications to a variety of environments.
• Security: FastAPI includes built-in security features such as automatic validation of input data, prevention of SQL injection attacks, and protection against cross-site scripting (XSS) attacks.

Overall, FastAPI is a highly performant and easy-to-use web framework for building APIs with Python. Its automatic documentation, scalability, compatibility, and security features make it a popular choice for developers who want to build high-quality web applications quickly and efficiently.