Webiny is an open-source serverless enterprise CMS that deploys to AWS and includes a headless CMS with GraphQL API, drag-and-drop page builder, form builder, and file manager. It offers multi-tenancy support, enterprise integrations with OKTA and Cognito, and can be customized for various use cases including marketing sites, SaaS applications, and multi-language portals. The platform runs on AWS serverless services like Lambda and DynamoDB for scalability and cost efficiency.