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Ur/Web is a programming language for creating web applications. It's designed to help developers build secure and efficient web services by integrating client and server code. Ur/Web combines HTML, CSS, JavaScript with server-side SQL queries and computational logic into a single codebase. The compiler checks that all communication follows specified protocols at compile time, reducing the likelihood of runtime errors in terms of database integrity or cross-site scripting vulnerabilities. Deployable both on traditional servers and through cloud-based platforms, Ur/Web assists in constructing high-performance websites while minimizing security risks associated with more loosely coupled architectures.