Webflow is a cloud-based design tool that allows users to build professional, responsive websites without the need for extensive coding knowledge. It combines a visual design interface with CMS functionality, allowing designers to create complex, dynamic sites visually. Webflow offers a range of templates and customizable elements, making it a popular choice for web designers seeking a balance between ease of use and the flexibility to create unique, custom designs. It's particularly favored for its responsive design capabilities and integration with other tools and platforms.