Twilio Flex is a fully programmable contact center platform that enables the launch of a contact center in minutes, allowing for complete customization through RESTful APIs and React.js UI components. It runs on top of Twilio's secure Super Network infrastructure, scaling elastically to thousands of agents. A free trial account includes 5,000 active user hours, with paid plans starting at $1 per active user hour or $150 per named user per month. The platform offers carrier connectivity and integrations through the Flex Marketplace, where new channels can be added instantly. A video demonstrates how to deploy a contact center using Flex in minutes, showcasing its features and customization options.