Sanic is a Python 3.5+ web framework that leverages the uvloop-based event loop for high performance, similar to Node.js. It's easy to use and provides non-blocking code via async/await syntax. Sanic allows developers to create asynchronous applications in Python, enabling them to build fast and scalable web applications. The framework is designed to be fast, with enhanced speed compared to Flask. It also supports query arguments in the request data and can be used to respond to text messages using Twilio. Ngrok is used to make a publicly accessible URL for the application, allowing it to receive POST requests from Twilio. Sanic is an open-source framework that's still evolving, with room for contributions and improvements.