Twilio Functions is a serverless environment that allows developers to write and run Twilio code without dealing with servers, providing a seamless communications experience. To address the challenges of building and scaling Twilio applications, such as setting up web servers and handling authentication, Twilio Functions provides a simplified solution by executing Node.js code on behalf of the developer. With 10k free invocations per month and pricing starting at $0.0001 per invocation after that, Twilio Functions is now available to everyone in public beta, offering developers the ability to prototype and build production-ready Twilio applications quickly and efficiently.