SolidStart is a full-stack meta-framework built on top of Solid.js. It adds server-side rendering, file-based routing, API routes, server functions, and resource streaming to Solid.js, enabling developers to build complete web applications without switching languages. Server-side rendering improves performance and SEO, while server functions eliminate the need for REST APIs in many cases. SolidStart is to Solid.js what Next.js is to React—a framework for building production web applications with best practices built-in.